Heartworm Testing Services for Pets

True or false: Most dogs only show signs of heartworm about six months after the initial infestation. Unfortunately, the answer is true! These parasites may look innocent enough, but they can cause irreversible organ damage, heart failure, lung disease and even death if left untreated. Unlike intestinal worms, heartworm can infiltrate the heart, lungs, blood vessels and other organs making way for several complications. With the help of our team, you can stop your pet from getting them in the first place. Call us at 905.885.8151 to learn how to protect your furry family member.

How can I protect my pet from getting heartworm?

The best (and easiest) way to prevent heartworm is by getting your pet on a heartworm preventive medication. There are many options available with different formulations and dosing schedules we can guide you on. The important thing to remember is pets need to be on a medication all year round. Missing just one or falling behind on your schedule can leave your pet unprotected.

What are signs of heartworm in pets?

When you start to notice persistent coughing, weight loss and reduced activity levels in your pet, they probably already have a serious parasitic infection. As we mentioned above, heartworm is virtually symptom-free in its early stages or if the pet has a small amount of worms. Regular check-ups are another way to screen for heartworm in your pet. A simple blood test is all it takes to check for heartworm.

How can pets get heartworm?

Your pet can get heartworm from a bite of a mosquito. Please note pets can still get heartworm in the wintertime. For example, if your pet was bitten in the summer, the larvae can develop if you skip their medications during the winter months. They can grow into adults and when you start the medications in the spring, it will no longer be effective on the mature heartworm. Mosquitos can also survive indoors in the colder months. In fact, approximately 30% of cats get heartworm in the winter – including those who live 100% indoors!

Last updated: July 13, 2021

Dear Clients,

With recent changes to restrictions on businesses, we are pleased to advise that 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, spays and neuters, dental services, and more!

NOTE: Due to the COVID-19 restrictions and limited staffing, we are unable to take new clients at the moment. We sincerely appreciate your kindness, patience and understanding during this time.


We are still operating curbside only for appointments and the pickup of medication and food. Please call the office at 905.885.8151 to let us know that you have arrived and wait for further instructions. Please do not leave a message if you are in the parking lot. Continue to call until you reach a receptionist. If you do not have a cell phone, please knock on the door. Please also let us know in advance so we can note it on the appointment. We accept debit and credit as the preferred payment method, however we continue to accept cash or check!


We are OPEN with the following hours:

  • Monday to Thursday: 8:30 am - 6:00 pm
  • Friday: 8:30 am - 2:00 pm
  • Saturday - Sunday: Closed
  • Thank you for your patience and understanding and we look forward to seeing you and your furry family members again!

    - Your dedicated team at Ganaraska Animal Clinic