Q: How is heartworm contracted and how do I keep my pets safe from it?
A: Heartworm is a parasite that is spread between animals through mosquito bites. Your veterinarian can prescribe heartworm prevention medication, which should be given monthly during the season when mosquitoes are active and feeding, typically from June to November in Ontario. Limiting exposure to mosquitoes will also help prevent infection. It is recommended to have your dog tested annually for heartworm – the earlier an infection is caught and treated, the less damage the infection will cause to the heart.