Ivermectin is the main ingredient in Canine Heartcare and is used primarily for prophylactic internal deworming. It is clinically effective in preventing parasites such as heartworm, roundworm and tapeworm infections. However, heartworm medication such as Canine Heartburn should not be used in Collies as it can cause adverse reactions and is not recommended for dogs with a confirmed heartworm infection to avoid serious secondary symptoms.
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