Our team continues to be here for you and your cherished pets. We are OPEN and are now able to provide a wide range of services. To learn more about the changes we have implemented in response to COVID-19 and what to expect during your next visit, click here.

Dog Heartworm Services

Heartworm Disease Tests

If a dog has heartworms, what symptoms should I look for?

Heartworm disease typically causes a cough, weight loss and poor exercise tolerance. This can also be true of many other diseases as well which may be more common, so testing for HWD is critical to making sure that this is not causing the clinical signs.

How does a dog get heartworms?

A dog gets heartworm disease from being bitten by a mosquito carrying the infective larvae which it has picked up after feeding on another canid which has heartworm disease.

What are the treatment options for heartworms?

It is much easier to prevent heartworm disease than to treat the clinical disease. Once clinical signs of heartworm develop due to infection, the damage to the heart and lungs can be irreparable. If an infection is identified early enough, injections which are painful and require hospitalization for several days can be done to clear the disease. We typically recommend preventive medication for dogs so that the larvae will not develop in the dog even if they are bitten by a mosquito carrying the disease.

Why is recovery for heartworm treatment so challenging?

Recovery after treating for heartworm disease is challenging as the adult heartworms can die and when pieces of the dead parasite are disseminated into the vascular system, this can cause severe reactions such as shock, or breathing issues or fever. Also, heartworm disease, may have caused serious damage to the heart muscle and lungs and result in congestive heart failure which is not reversible.


2018 readers choice awards certificate for Clarkson Village Animal Hospital

2018 Readers' Choice Awards Winner!

We are so happy to announce that we have won the 2018 Reader’s Choice Award in Mississauga in the category of Best Veterinary Hospitals! This award is very special to us as the voting is done by the community and our clients. We would like to thank every person who took the time to vote, or even took the time to share your experience with someone else.

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Last updated: May 29, 2020

Dear Clients,

With recent changes to restrictions on businesses, we are pleased to advise that effective May 19, 2020 the restrictions on veterinary practices have been lifted. Based on these changes, below are some important updates to our operating policies.


This includes vaccines, wellness exams, blood work, heartworm testing, spays and neuters, dental services, and more!



If you wish to connect with a veterinarian via message, phone or video, visit our website and follow the "Online Consultation" link.


We continue to be open 24 hours a day, 7 days a week


Have you welcomed a new furry family member to your home? We’d love to meet them! Visit our Must Know New Pet Owner Information page for useful resources and helpful recommendations for new pet owners.

Thank you for your patience and understanding and we look forward to seeing you and your furry family members again!

- Your dedicated team at Clarkson Village Animal Hospital