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Looking for information or educational tools on heartworm management? Our NEW Heartworm Resource Center makes it easy to get the answers or assets you’re looking for. You may search/filter by one or more of the fields below.



Does a dog with a positive Ag test and negative MF test need to be treated for heartworms?

The results of heartworm tests can sometimes raise questions as well as provide answers. This Clinical FAQ uses an algorithm to explain what veterinarians can conclude from differing test results

Category: Clinical FAQs
Canine | Diagnosis | Treatment | Life Cycle | Shelters | Veterinary Professionals

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Feline heartworm: Are YOU looking for it?

In this article, which was published in VETgirl's e-magazine, Dr. Tom Nelson explains the "how tos" of feline heartworm diagnosis.

Category: Clinical FAQs
Feline | Prevention | Diagnosis | Veterinary Professionals | Incidence

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New AHS Heartworm Incidence Map

In this Clinical Q&A, AHS President Dr. Jenni Rizzo explains the findings of the 2022 Heartworm Incidence Survey and what they tell us about the spread of heartworms in the U.S. as well as long-timer and emergy "hot spots."

Category: Clinical FAQs
Canine | Prevention | Diagnosis | Shelters | Veterinary Professionals | Incidence

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Which heartworm preventive is best?

With so many heartworm preventives available, it's not unreasonable for clients--and even veterinarians--to wonder which one is "best." The truth is that the BEST preventive is--quite simply--the preventive a pet owner will GIVE. As Dr. Elizabeth Clyde explains, factors like cost, covenience, mode of administration and frequency of administration all come into play.

Category: Clinical FAQs
Prevention | Veterinary Professionals | Cost

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Patient Management after Two Melarsomine Injections

A newly adopted patient received two injections instead of three when treated for heartworm. Veterinarian Angele Bice explains.

Category: Clinical FAQs
Canine | Treatment | Shelters | Veterinary Professionals | Cost

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Managing Heartworm Disease in Zoo Animals

Zoo animals like marine mammals, big cats and others can become infected with heartworms. Fortunately, prevention is possible.

Category: Clinical FAQs
Prevention | Diagnosis | Exotics | Veterinary Professionals

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When a Treated Dog has Persistent Microfilaria

Dr. Tom Nelson explains the potential reasons a dog may test positive for microfilaria following heartworm treatment

Category: Clinical FAQs
Canine | Diagnosis | Treatment | Shelters | Veterinary Professionals

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Role of Antigen and Antibody Testing in Heartworm-Positive Cats

Veterinary parasitologist Dr. Lindsay Starkey outlines the role of antigen and antibody tests for heartworm screening in cats

Category: Clinical FAQs
Prevention | Diagnosis | Shelters | Veterinary Professionals

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Exercise Restriction Advice for Dogs Undergoing Heartworm Treatment

Successful treatment of dogs with heartworm infection requires keeping them quiet and calm, as Dr. Brian DiGangi explains.

Category: Clinical FAQs
Canine | Treatment | Shelters | Veterinary Professionals

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How to Treat Heartworm-Positive Cats

There are no approved heartworm treatments for cats, but veterinarians do have options when managing these patients. Veterinary cardiologist Dr. Marisa Ames explains.

Category: Clinical FAQs
Feline | Prevention | Treatment | Shelters | Veterinary Professionals

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Heartworm Diagnostics: Antigen Tests Alone Aren't Enough

How reliable are patient-side heartworm antigen tests? Veterinary parasitologist Dr. Lindsay Starkey explains.

Category: Clinical FAQs
Canine | Diagnosis | Veterinary Professionals

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Antigen Test Timing Following Melarsomine Treatment

How long should I wait before re-testing dogs undergoing heartworm treatment? Dr. Tom Nelson explains the timing.

Category: Clinical FAQs
Canine | Diagnosis | Treatment | Veterinary Professionals

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When Heartworm Treatment is Interrupted

When treating dogs for heartworm, what if there's a delay between giving doxycycline and melarsomine? Dr. Chris Duke explains.

Category: Clinical FAQs
Canine | Treatment | Veterinary Professionals

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Managing Dogs Treated with Non-AHS Protocols

When treating dogs for heartworm, what's the difference in efficacy between two and three injections of melarsomine? Dr. Angele Bice breaks it down.

Category: Clinical FAQs
Canine | Treatment | Veterinary Professionals

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Hit the “Reset” Button on your Client Education Program

How should I educate my clients about heartworm prevention this spring? Dr. Chris Duke shares tips.

Category: Clinical FAQs
Canine | Feline | Prevention | Exotics | Other | Veterinary Professionals

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Safe Transport of Heartworm-Positive Dogs

How can I safely transport dogs in the midst of heartworm treatment? Dr. Brian DiGangi shares the AHS/ASV recommendations.

Category: Clinical FAQs
Canine | Diagnosis | Treatment | Shelters | Veterinary Professionals | Transport of Infected Pets

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What’s the Protocol?

Marisa Ames,DVM, DACVIM (cardiology)
Associate Professor
Colorado State University,
College Of Veterinary Medicine

Category: Clinical FAQs
Canine | Treatment | Veterinary Professionals

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Heartworm Disease Causes Lifelong Damage

Can heartworm infection cause permanent damage in dogs? The answer is yes, says Dr. Stephen Jones.

Category: Clinical FAQs
Canine | Prevention | Treatment | Veterinary Professionals

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Heartworm Diagnostics: Antigen Tests Alone Aren’t Enough

How reliable are patient-side heartworm antigen tests? Veterinary parasitologist Dr. Lindsay Starkey explains.

Category: Clinical FAQs
Canine | Diagnosis | Veterinary Professionals

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Making the Case for Heartworm Prevention in Cats

Why is heartworm prevention important for cats? Dr. Elizabeth Clyde gives reasons.

Category: Clinical FAQs
Feline | Prevention | Veterinary Professionals

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The States of Heartworm Incidence

What does the latest AHS survey say about heartworm incidence? Dr. Chris Duke explains.

Category: Clinical FAQs
Canine | Feline | Exotics | Other | Veterinary Professionals | Incidence

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Tackling Tough Conversations

Can I cut corners on the AHS heartworm treatment protocol for dogs? AHS Past President Dr. Chris Rehm says "no."

Category: Clinical FAQs
Canine | Treatment | Veterinary Professionals

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The Wrath and Aftermath of Hurricanes

How can hurricanes lead to increases in heartworm incidence? There's a link, according to veterinary cardiologist Dr. Clarke Atkins.

Category: Clinical FAQs
Canine | Feline | Prevention | Veterinary Professionals | Transport of Infected Pets | Resistance

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The AHS Guidelines: 2018 Updates - Guidance on Prevention, Testing and Treatment

The AHS Guidelines: 2018 Updates - Guidance on Prevention, Testing and Treatment

Category: Clinical FAQs
Canine | Prevention | Diagnosis | Treatment | Veterinary Professionals

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