Heartgard Chewables for Dogs Powerful protection from heartworm. Tasty Heartgard chewables for dogs prevent heartworm infection for a full month. Prevents heartworm disease Prevents development of adult stage heartworms Recommended for year-round use Beef flavor chewable Prescription Heartgard chewables contain the highly effective active ingredient Ivermectin that prevents heartworm infection by killing the parasite at the larval stage. By giving your dog a chewable once a month on the same day
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