info@heartwormsociety.orgCartSign In

Heartworm University

A Complete Interactive Continuing Education Program on Heartworm Disease - Hear the latest information on controversial topics such as "slow kill" and macrocyclic lactone lack of efficacy investigations. Don't miss the opportunity to hear about the latest findings and participate in this highly acclaimed, interactive and informative presentation!

Heartworm University comprises 4-6 hours of practical clinical information in a lively interactive format.  When Heartworm University is offered in conjunction with a state or regional meeting there is no additional charge to attend. Our expert faculty will present a comprehensive program including the latest information on heartworm disease available.  An advanced computer-interactive response system enables the presenters to address specific audience concerns. Course content features a discussion of controversial issues while integrating essential disease pathophysiology, diagnostics, screening and testing, treatment protocols, prevention strategies, and pet owner counseling.

Upcoming Heartworm University Events

Preliminary Heartworm University Schedule Announced

AHS Symposia, proceedings bring heartworm education to veterinary professionals

From Singapore to Baton Rouge to office computers everywhere, the American Heartworm Society (AHS) is redoubling efforts to bring the latest heartworm information directly to veterinarians and veterinary nurses via scientific symposia and proceedings.

A preliminary schedule for Heartworm University—a traveling 4- to 6-hour symposium taught by AHS faculty—includes the following dates and venues:

  • Tennessee VMA/Music City Conference, February 25, 2018. This 6-hour session, which will be taught by veterinary cardiologist Dr. Clarke Atkins, will be held in Murfreesboro, Tennessee. For more information see
  • Emerald Coast Veterinary Conference, June 14, 2018. This 4-hour session, presented by AHS past president Dr. Stephen Jones, will be held at the Sandestin Golf & Beach Resort in Destin, Florida. For more information see

Heartworm University provides practical clinical information in an interactive format that enables presenters to address specific audience concerns and questions. Course content incorporates essential disease pathophysiology, diagnostics, screening and testing, treatment protocols, prevention strategies, and pet owner counseling, while also covering issues such as heartworm incidence trends and resistance.

15th Triennial Symposium Proceedings available as free download
The latest AHS Triennial Symposium proceedings was recently published as a special supplement to Parasites and Vectors and is available worldwide for the first time in the symposium’s history as a free download. With 28 papers, it is the largest proceedings ever, covering topics from disease biomarkers to resistance to diagnostic and treatment protocols. In past years, proceedings were made available free to AHS members and on a fee basis to non-members; however, given the Society’s goal of being the leading resource on heartworm information, the AHS board made the decision to make the proceedings available to all veterinarians and veterinary nurses free of charge.

About the AHS
Founded during the Heartworm Symposium of 1974, the American Heartworm Society (AHS) aims to further scientific progress in the study of heartworm disease, inform the membership of new developments and encourage and help promote effective produces for the prevention, diagnosis and treatment of heartworm disease. Information and resources on heartworm disease can be found at, while an online treatment app can be found at

Frequently Asked Questions on Heartworm Treatment in Shelters

When should we perform spay-neuter surgery in a heartworm-positive dog?

In dogs with mild infection and no clinical signs of heartworm disease, it is safest to perform spay-neuter surgery prior to beginning adulticidal therapy. At least one study described no evidence of clinically relevant perioperative complications when sterilizing heartworm-positive dogs, and many high-quality, high-volume spay-neuter clinics and shelters regularly engage in this practice. Adulticidal therapy may be administered upon recovery from anesthesia.

In cases when adulticidal therapy has already been initiated, anesthetic procedures should be delayed for 6 months to ensure clearance of dying worms.


How can we maintain exercise restriction and protect behavioral health in the shelter environment?

Minimizing physical activity, restricting exercise, and ensuring dogs are safely confined when unsupervised are important components of minimizing complications from heartworm treatment. To ensure success during recovery, steps should be taken to provide safe physical and mental stimulation and to meet dogs’ needs for social interaction.

Most dogs can be safely leash-walked during the treatment recovery period and providing appropriate chew toys can help relieve some of that stored up physical energy. During confinement, reading to dogs can help decrease arousal and stress and there are many simple, inexpensive ways to provide in-kennel enrichment. Taking advantage of feeding times to provide mental stimulation as well as ensuring that a variety of stimulating activities are provided can help keep the canine mind active and healthy.


Can heartworms be transmitted to unborn puppies?

Transmission of heartworms requires a bite from an infected mosquito, so direct transmission from a mother to her unborn puppies is not possible. It is possible for the microscopic baby worms (called microfilaria) to pass through the bloodstream of the mother into the puppies; however, these worms cannot develop into adults and should be eliminated when the puppies receive their first dose of heartworm preventive. Until the worms are eliminated, those infected puppies could serve as sources of infection for nearby mosquitoes and unprotected dogs.


Is it safe to give heartworm preventives to a pregnant or nursing dog?

All heartworm preventives are approved as safe and effective in breeding, pregnant, and lactating dogs when used according to label directions.


Is it safe to treat heartworms in a pregnant or nursing dog?

The use of melarsomine adulticidal therapy in pregnant dogs has not been studied. In cases where a litter will be carried to term, adulticidal therapy should be delayed until weaning unless immediate treatment for severe infection is indicated as a means of preserving life.


How can we decide if heartworm testing is the best use of our resources?

The American Heartworm Society believes it is in the best interest of all dogs greater than 6 months of age to be tested for both heartworm antigen and microfilariae on an annual basis and whenever a change in heartworm preventive medication is planned.

In the shelter setting, when allocating resources for diagnostic testing for any disease or condition, including heartworms, additional considerations should include assessment of impact on shelter operations, animal and human health, and specific disease characteristics.


Should we treat dogs with heartworms in our shelter?

As with diagnostic testing in shelters, understanding which diseases can be treated in a given organization and establishing sound treatment protocols requires careful consideration and resource assessment. Capacity of existing facilities and staff as well as the time and financial commitment required to provide treatment for a given disease must all be evaluated. When definitive treatment is not feasible, steps should be taken to minimize heartworm transmission in microfilaremic dogs and to limit exposure of the shelter population to infected mosquitoes.


Is it safe to relocate a heartworm-positive dog for adoption?

Relocation of heartworm-positive dogs should be reconsidered unless life-saving opportunities and resources can be provided at the destination. All dogs greater than 6 months of age should be tested and all dogs 8 weeks of age and older should be started on heartworm preventive therapy prior to relocation. When dogs test positive and relocation cannot be postponed, steps should be taken to minimize heartworm transmission in microfilaremic dogs.

Dogs that have undergone adulticidal therapy in preparation for relocation should not be transported for at least 4 weeks after melarsomine injection.


Can we treat dogs with two injections of melarsomine instead of three to get them out of the shelter faster?

The American Heartworm Society recommends that all dogs be treated with three doses of melarsomine for the safest and most efficacious adulticidal therapy. This course of treatment, consisting of one injection followed by two injections given 24 hours apart 1 month later, should result in the clearance of 99% of the worms.

For dogs with asymptomatic, mild, or moderate disease, melarsomine dihydrochloride is also labeled for two treatments given 24 hours apart. Limiting the treatment course to two treatments should result in the clearance of approximately 90% of the worms.

When choosing a treatment course in the shelter, efficacy, clinical safety, and duration of treatment must all be considered. Regardless of the course pursued, clear documentation of all treatments provided and recommendations for follow-up after adoption should be provided to each adopter.


Is there a cheaper alternative for heartworm treatment other than melarsomine?

Melarsomine dihydrochloride is the only treatment labeled for use as an adulticide and is the safest, most efficacious, and fastest way to ensure clearance of adult heartworms. Other therapeutic combinations may be effective; however, these all require a substantially prolonged treatment course to obtain equivalent worm death. The pros and cons of alternative treatment regimens should be carefully weighed.

When definitive adulticidal therapy with melarsomine cannot be provided immediately, heartworm-positive dogs should be started on a 4-week course of doxycycline and a monthly preventive with a macrocyclic lactone until such treatment can be provided. Exercise restriction should be maintained during this time.


Should dogs being treated for heartworms receive pain medications?

Pain, swelling, and tenderness at the melarsomine injection site are the most common treatment complications. These can be minimized through the use of careful injection technique and a variety of pain medications when needed. Administration of local anesthetics prior to injection is not recommended as these treatments carry their own risk of discomfort and can interfere with proper melarsomine injection.


Shelter Educational Brochures

New from AHS and the Association of Shelter Veterinarians: Educational Brochures on Heartworm for People Adopting from a Shelter

Videos: 2016 NAVC Symposium

Watch EyeOn Heartworm Presentations from the 2016 NAVC Symposium.

Heartworm Basics

Heartworms in Dogs  Heartworms in Cats

What is heartworm disease?

Heartworm disease is a serious and potentially fatal disease in pets in the United States and many other parts of the world. It is caused by foot-long worms (heartworms) that live in the heart, lungs and associated blood vessels of affected pets, causing severe lung disease, heart failure and damage to other organs in the body. Heartworm disease affects dogs, cats and ferrets, but heartworms also live in other mammal species, including wolves, coyotes, foxes, sea lions and—in rare instances—humans. Because wild species such as foxes and coyotes live in proximity to many urban areas, they are considered important carriers of the disease.

Dogs. The dog is a natural host for heartworms, which means that heartworms that live inside the dog mature into adults, mate and produce offspring. If untreated, their numbers can increase, and dogs have been known to harbor several hundred worms in their bodies. Heartworm disease causes lasting damage to the heart, lungs and arteries, and can affect the dog’s health and quality of life long after the parasites are gone. For this reason, heartworm prevention for dogs is by far the best option, and treatment—when needed—should be administered as early in the course of the disease as possible. Learn more about heartworm medicine for dogs.

Cats. Heartworm disease in cats is very different from heartworm disease in dogs. The cat is an atypical host for heartworms, and most worms in cats do not survive to the adult stage. Cats with adult heartworms typically have just one to three worms, and many cats affected by heartworms have no adult worms. While this means heartworm disease often goes undiagnosed in cats, it’s important to understand that even immature worms cause real damage in the form of a condition known as heartworm associated respiratory disease (HARD). Moreover, the medication used to treat heartworm infections in dogs cannot be used in cats, so prevention is the only means of protecting cats from the effects of heartworm disease.

How is heartworm disease transmitted from one pet to another?

life-cycle-largeThe mosquito plays an essential role in the heartworm life cycle. Adult female heartworms living in an infected dog, fox, coyote, or wolf produce microscopic baby worms called microfilaria that circulate in the bloodstream. When a mosquito bites and takes a blood meal from an infected animal, it picks up these baby worms, which develop and mature into “infective stage” larvae over a period of 10 to 14 days. Then, when the infected mosquito bites another dog, cat, or susceptible wild animal, the infective larvae are deposited onto the surface of the animal's skin and enter the new host through the mosquito’s bite wound. Once inside a new host, it takes approximately 6 months for the larvae to mature into adult heartworms. Once mature, heartworms can live for 5 to 7 years in dogs and up to 2 or 3 years in cats. Because of the longevity of these worms, each mosquito season can lead to an increasing number of worms in an infected pet.

What are the signs of heartworm disease in dogs?

In the early stages of the disease, many dogs show few symptoms or no symptoms at all. The longer the infection persists, the more likely symptoms will develop. Active dogs, dogs heavily infected with heartworms, or those with other health problems often show pronounced clinical signs.

Signs of heartworm disease may include a mild persistent cough, reluctance to exercise, fatigue after moderate activity, decreased appetite, and weight loss. As heartworm disease progresses, pets may develop heart failure and the appearance of a swollen belly due to excess fluid in the abdomen. Dogs with large numbers of heartworms can develop a sudden blockages of blood flow within the heart leading to a life-threatening form of cardiovascular collapse. This is called caval syndrome, and is marked by a sudden onset of labored breathing, pale gums, and dark bloody or coffee-colored urine. Without prompt surgical removal of the heartworm blockage, few dogs survive.

What are the signs of heartworm disease in cats?

Signs of heartworm disease in cats can be very subtle or very dramatic. Symptoms may include coughing, asthma-like attacks, periodic vomiting, lack of appetite, or weight loss. Occasionally an affected cat may have difficulty walking, experience fainting or seizures, or suffer from fluid accumulation in the abdomen. Unfortunately, the first sign in some cases is sudden collapse of the cat, or sudden death.

How significant is my pet's risk for heartworm infection?

95-2013Many factors must be considered, even if heartworms do not seem to be a problem in your local area. Your community may have a greater incidence of heartworm disease than you realize—or you may unknowingly travel with your pet to an area where heartworms are more common. Heartworm disease is also spreading to new regions of the country each year. Stray and neglected dogs and certain wildlife such as coyotes, wolves, and foxes can be carriers of heartworms. Mosquitoes blown great distances by the wind and the relocation of infected pets to previously uninfected areas also contribute to the spread of heartworm disease (this happened following Hurricane Katrina when 250,000 pets, many of them infected with heartworms, were “adopted” and shipped throughout the country).

The fact is that heartworm disease has been diagnosed in all 50 states, and risk factors are impossible to predict. Multiple variables, from climate variations to the presence of wildlife carriers, cause rates of infections to vary dramatically from year to year—even within communities. And because infected mosquitoes can come inside, both outdoor and indoor pets are at risk.

For that reason, the American Heartworm Society recommends that you “think 12:” (1) get your pet tested every 12 months for heartworm and (2) give your pet heartworm preventive 12 months a year.

What do I need to know about heartworm testing?

Heartworm disease is a serious, progressive disease. The earlier it is detected, the better the chances the pet will recover. There are few, if any, early signs of disease when a dog or cat is infected with heartworms, so detecting their presence with a heartworm test administered by a veterinarian is important. The test requires just a small blood sample from your pet, and it works by detecting the presence of heartworm proteins. Some veterinarians process heartworm tests right in their hospitals while others send the samples to a diagnostic laboratory. In either case, results are obtained quickly. If your pet tests positive, further tests may be ordered.

When should my pet be tested?

Testing procedures and timing differ somewhat between dogs and cats.

Dogs. All dogs should be tested annually for heartworm infection, and this can usually be done during a routine visit for preventive care. Following are guidelines on testing and timing:

  • Puppies under 7 months of age can be started on heartworm prevention without a heartworm test (it takes at least 6 months for a dog to test positive after it has been infected), but should be tested 6 months after your initial visit, tested again 6 months later and yearly after that to ensure they are heartworm-free.
  • Adult dogs over 7 months of age and previously not on a preventive need to be tested prior to starting heartworm prevention.  They, too, need to be tested 6 months and 12 months later and annually after that.
  • You need to consult your veterinarian, and immediately re-start your dog on monthly preventive—then retest your dog 6 months later. The reason for re-testing is that heartworms must be approximately 7 months old before the infection can be diagnosed.

Annual testing is necessary, even when dogs are on heartworm prevention year-round, to ensure that the prevention program is working. Heartworm medications are highly effective, but dogs can still become infected. If you miss just one dose of a monthly medication—or give it late—it can leave your dog unprotected. Even if you give the medication as recommended, your dog may spit out or vomit a heartworm pill—or rub off a topical medication. Heartworm preventives are highly effective, but not 100 percent effective. If you don’t get your dog test, you won’t know your dog needs treatment.

Cats. Heartworm infection in cats is harder to detect than in dogs, because cats are much less likely than dogs to have adult heartworms. The preferred method for screening cats includes the use of both an antigen and an antibody test (the “antibody” test detects exposure to heartworm larvae). Your veterinarian may also use x-rays or ultrasound to look for heartworm infection. Cats should be tested before being put on prevention and re-tested as the veterinarian deems appropriate to document continued exposure and risk. Because there is no approved treatment for heartworm infection in cats, prevention is critical.

What happens if my dog tests positive for heartworms?

No one wants to hear that their dog has heartworm, but the good news is that most infected dogs can be successfully treated. The goal is to first stabilize your dog if he is showing signs of disease, then kill all adult and immature worms while keeping the side effects of treatment to a minimum.

Here's what you should expect if your dog tests positive:

  • Confirm the diagnosis. Once a dog tests positive on an antigen test, the diagnosis should be confirmed with an additional—and different—test. Because the treatment regimen for heartworm is both expensive and complex, your veterinarian will want to be absolutely sure that treatment is necessary.
  • Restrict exercise. This requirement might be difficult to adhere to, especially if your dog is accustomed to being active. But your dog’s normal physical activities must be restricted as soon as the diagnosis is confirmed, because physical exertion increases the rate at which the heartworms cause damage in the heart and lungs. The more severe the symptoms, the less activity your dog should have.
  • Stabilize your dog's disease. Before actual heartworm treatment can begin, your dog’s condition may need to be stabilized with appropriate therapy. In severe cases of heartworm disease, or when a dog has another serious condition, the process can take several months.
  • Administer treatment. Once your veterinarian has determined your dog is stable and ready for heartworm treatment, he or she will recommend a treatment protocol involving several steps. The American Heartworm Society has guidelines for developing this plan of attack. Dogs with no signs or mild signs of heartworm disease, such as cough or exercise intolerance, have a high success rate with treatment. More severe disease can also be successfully treated, but the possibility of complications is greater. The severity of heartworm disease does not always correlate with the severity of symptoms, and dogs with many worms may have few or no symptoms early in the course of the disease.
  • Test (and prevent) for success. Approximately 6 months after treatment is completed, your veterinarian will perform a heartworm test to confirm that all heartworms have been eliminated. To avoid the possibility of your dog contracting heartworm disease again, you will want to administer heartworm prevention year-round for the rest of his life.

What if my cat tests positive for heartworms?

Like dogs, cats can be infected with heartworms. There are differences, however, in the nature of the disease and how it is diagnosed and managed. Because a cat is not an ideal host for heartworms, some infections resolve on their own, although these infections can leave cats with respiratory system damage. Heartworms in the circulatory system also affect the cat’s immune system and cause symptoms such as coughing, wheezing and difficulty breathing. Heartworms in cats may even migrate to other parts of the body, such as the brain, eye and spinal cord. Severe complications such as blood clots in the lungs and lung inflammation can result when the adult worms die in the cat’s body.

Here’s what to expect if your cat tests positive for heartworm:

  • Diagnosis. While infected dogs may have 30 or more worms in their heart and lungs, cats usually have 6 or fewer—and may have just one or two. But while the severity of heartworm disease in dogs is related to the number of worm, in cats, just one or two worms can make a cat very ill. Diagnosis can be complicated, requiring a physical exam, an X-ray, a complete blood count and several kinds of blood test. An ultrasound may also be performed.
  • Treatment. Unfortunately, there is no approved drug therapy for heartworm infection in cats, and the drug used to treat infections in dogs is not safe for cats. Nevertheless, cats with heartworm disease can often be helped with good veterinary care. The goal is to stabilize your cat and determine a long-term management plan.
  • Monitor your cat. Heartworm-positive cats may experience spontaneous clearing of heartworms, but the damage they cause may be permanent. If your cat is not showing signs of respiratory distress, but worms have been detected in the lungs, chest X-rays every 6 to 12 months may be recommended. If mild symptoms are noted, small doses of prednisolone may be administered to help reduce inflammation.
  • Provide veterinary care. If the disease is severe, additional support may be necessary. Your veterinarian my recommend hospitalization in order to provide therapy, such as intravenous fluids, drugs to treat lung and heart symptoms, antibiotics, and general nursing care. In some cases, surgical removal of heartworms may be possible.
  • Maintain prevention. A cat that has developed heartworm disease has demonstrated that it is susceptible to heartworm infection, and both outdoor and indoor cats are at risk. It’s important to give your cat monthly heartworm preventives, which are available in both spot-on and pill form. Preventives keep new infections from developing if an infected mosquito bites your cat again.

More questions about heartworm disease

Prevention Calendar 2016-17

18 months of heartworm messages—download NOW!

With most heartworm preventives given on a monthly basis, nothing makes a better reminder than a calendar dedicated to heartworm protection. An updated 18-month calendar combining prevention messages with fun companion animal photos is now available from the American Heartworm Society. Download it for free, print it and hang it in your clinic. It also makes a great gift for clients.

Notes on printing: this file has been adapted to fit on 11 x 17 paper stock. If your in-house printer can accommodate tabloid-size paper, simply download the PDF file and print it out. You can also download the file and take it or send it to a local business (such as FedEx Kinko’s or other printer with a digital press) to output for you. No need to print front and back; no need to bind the pages unless you wish to. Print enough copies to post in each exam room and waiting area!

pdfDownload 2016-2017 Calendar

Heartworm Preventive Waiver

Use this waiver to convince owners that it is worth giving pets a preventive.

Heartworm Incidence Maps

Tracking the impact of heartworm disease

Every three years, the American Heartworm Society (AHS) gathers data on heartworm testing to understand the impact heartworm is having nationwide, as well as in specific regions. Testing data from thousands of veterinary practices and shelters is used to create a detailed map showing the average number of heartworm-positive cases per clinic.


AHS Images

Media representatives and members are welcome to use the official American Heartworm Society logo and images below for promotional purposes. Please give proper attribution.

Heartworm Life Cycle Illustration

The American Heartworm Society has updated the heartworm life cycle for use in the veterinary clinic and for pet owners.

Both versions are available in either color or black and white. Click on the life cycle you would prefer to download and print.

Dog & Cat Heartworm Combined Life Cycle Posters

Dog & Cat Individual Heartworm Life Cycle Posters

Heartworm Treatment Dosage App

We are developing a series of apps to benefit veterinary professionals. Now treating dogs with heartworm disease is more straightforward than ever. With the new web-based AHS Treatment Plan app you have the precise regimen you need at your fingertips.

Announcing a new AHS Treatment Plan app that helps you create customized canine heartworm treatment regimens using your tablet, smartphone, or other electronic device. Select drugs, calculate dosages, and customize therapy for individual pets with heartworm disease. The uncomplicated app design makes it easy to use right in your office with the patient and owner present.

Print a hard copy for your client  or send the plan directly to their smartphone. Use the app for client education, too. Along with the dosage calculator and detailed, step-by-step display of treatment phases, you'll find a clearly illustrated heartworm life cycle chart and video for use when explaining how heartworms infect a pet.

Treatment plans are based on the new AHS Current Canine Guidelines.

To use this FREE web-based app now, click the link below or visit

Bookmark for easy access!
For iOS devices, browse to, then choose "Save to Home Screen."
For Android devices, browse to, then select "Save Bookmark to Home Screen."
For PC or Mac, browse to, use CTRL+D.

Heartworm Dosage Calculator  

Heartworm Images

Up-close and personal

Sometimes the most dramatic way to illustrate the importance of heartworm treatment and prevention is a photo that shows the true impact of the disease. The images below are provided by the American Heartworm Society for veterinary use.

Click an image below to see a full-resolution version.  You may then save the image by right-clicking (PC) or CTRL + Click (Mac) and choosing "Save image" from the popup menu.

Heartworm Guidelines

Official guidelines from the American Heartworm Society

Guidelines for the Diagnosis, Prevention, and Management of Heartworm (Dirofilaria immitis) Infection in Dogs and Cats. For your convenience, guidelines are offered in both full and summary formats.

Caninio - Español Canin - Français Canino - Italiano Canino - Português

Felino - Español Félin - Français Felino - Italiano Hunden (Zusammenfassung) - Deutsche

犬-繁體中文 (Canine - Traditional Chinese) 貓-繁體中文 (Feline - Traditional Chinese)

猫-简体中文 (Feline - Simplified Chinese) 犬-简体中文 (Canine - Simplified Chinese)

Heartworm Videos for Clients

Watch and learn

These videos produced by the American Heartworm Society help you communicate the importance of early heartworm diagnosis and prevention. Feel free to post them on your social media platforms to promote your practice and increase understanding. 


Heartworm Prevention Posters

Your walls will talk

Our beautiful new set of posters make a strong impression. Click on any poster thumbnail below to access a high-resolution version that you are invited to print or share.

Click an image below to see a full-resolution version. You may then save the image by right-clicking (PC) or CTRL + Click (Mac) and choosing "Save image" from the popup menu.

Pet Owner Education

Grounded/Unfounded Series

Think 12 Series

Think 12 Fact Sheets

Prevention all year long

There is no "off-season" for heartworm prevention and treatment. The handouts below make perfect value-added conversation starters with clients and prospective patients. Feel free to print and distribute in your practice.


Order Printed Publications

You may order pre-printed versions of our publications two ways, by mail or online.

All mail orders must be prepaid. Checks should be made payable to AHS (US dollars only). For the Heartworm Disease in Dogs and Heartworm Disease in Cats brochures, shipping charges are $12.00 for orders less than 1000 brochures and $15.00 for orders of 1000 or more brochures.  

There is no charge for the Agonizing to Treat Booklets but there are shipping charges detailed below.

The American Heartworm Society
Post Office Box 8266
Wilmington, DE 19803-8266

Download Mail-Order PDF Form

Searchable PDF files of all Triennial Symposium proceedings dating back to 1974 are now available as free downloads to AHS members. Simply log in to the member section of the website.  

Printed copies of the AHS Triennial Symposium proceedings from years 1980 to 2013 are still available upon request. Contact us at to request a specific proceedings. There is a shipping and handling fee of $10 per copy for mailed copies.



AHS Member Resources

Thank you for being a member of the American Heartworm Society. Your participation in the AHS facilitates the global effort to improve the diagnosis, treatment, and prevention of heartworm disease. Membership will keep you informed on vital developments regarding heartworm disease and provide valuable client educational tools. 


Since the establishment of the American Heartworm Society in 1974, a symposium has been held every three years for the purpose of presenting the latest research on heartworm disease, diagnosis, and prevention. Presenters at each symposium come from all over the world.

Proceedings are published and made available to all AHS members.


Join AHS.

Join the leading association on Heartworm education and prevention today!

Already a Member? Sign in here.

Get the Latest.

Twitter: @AHS_Think12