A heartworm prevention program is a must for any canine companion living in Markham or elsewhere in the GTA. This parasite—Dirofilaria immitis—belongs to the same class of worms as roundworm. If your pup becomes infected, heart failure may be the ultimate result. Though heartworm disease can be cured in some cases, the treatment is aggressive and complications are highly feasible. Ultimately getting your dog treated early for heartworm prevention in Markham is the best way to minimize your pet’s risk.