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What You Need to Know About Heartworm in Canada

Heartworm disease in dogs is caused by mosquitoes, and spread by the Dirofilaria immitis parasite, resulting in coughing, difficulty breathing, and death.

While it's not common in Canada, it can still happen - particularly if you travel with your dogs, or you are adopting a dog from a warm part of the world. Here's what you need to know to recognize the symptoms of heartworm, so you can get the treatment your dog needs.

Symptoms of Heartworm

When dogs are first infected with heartworm, no symptoms are visible, and even a blood test won’t detect the disease at first. Signs of the disease start to appear during the final molt of the heartworm larvae, when it arrives in the right ventricle and surrounding blood vessels. The artery lining is damaged within the next few days, and inflammation sets in. The damage caused by heartworm, is unfortunately, much faster than the body is able to heal itself, so the damage escalates.

Dogs begin to cough, have nose bleeds and experience shortness of breath, are exercise intolerant, and develop a type of pneumonia as well, due to an increase in lung inflammation.

Treatment for Heartworm

Treatment varies from one dog to the other, with each animal’s condition being evaluated separately and treated accordingly, and tailored to give a full recovery with the least side effects. Depending on the condition of their pet, dog owners, together with their vet, will decide which form of treatment will suite their dog best. There are two basic areas involved in treatment for heartworm:

  • Evaluating and stabilizing the patient for the treatment procedure
  • Eliminating all forms of the heartworm parasite, including the adult, larvae, and microfilaria

Diagnosis of Heartworm

Any dog suspected of having heartworm disease, will have a full medical history taken, and will also undergo chest x-rays, routine blood chemistry tests, as well as a complete physical examination.

Heartworm is a dangerous disease, and one of the most severe signs of the disease is called the Caval syndrome, or vena Caval syndrome, which causes an almost complete blockage of blood flow in the dog’s body, causing the dog to collapse. Very often, there are no signs of heart disease before the dog collapses, but when fainting and collapse do occur, severe shock sets in, red blood cells are destroyed, and death often follows within the next 2 days.

The only chance of survival sometimes in these cases, is for the vet to remove the heartworms surgically from the heart, via the jugular vein. If the vet can remove enough of the heartworms to allow the blood to flow freely again, then there is a slight chance of the dog surviving.

Areas and Breeds Affected by Heartworm

Dogs throughout the world are affected by heartworm. The disease however, is most common in the warm areas of the world where mosquitoes are present throughout the year. According to statistics, male dogs more than females are a bit more prone to the disease. Large breed dogs, short-haired dogs, as well as dogs which are kept outside tend to suffer more from the disease than other dogs do.

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