By Dr. Ken McMillan
DTN Contributing Editor
QUESTION:
I give my dog heartworm preventive every month, but my vet told me he's seen cases where consistently-treated dogs still develop heartworms. How is this possible? I've been told we are to use this preventive every month of the year, but I wonder if that can actually cause resistance in these worms? Using antibiotics too often can create resistant bacteria, so why doesn't heartworm preventive do the same thing? Please explain the difference.
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The days are getting shorter, the nights are cooler, leaves are starting to turn, and football season is here. But that doesn’t mean your clients can forget about protecting their pets from heartworms.
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