Heartworm Testing for Pets

Did you know heartworms can live in your pet’s hearts and lungs for years without them showing any symptoms? Eventually, if undetected for too long, heartworms can reproduce at a fatal rate. This is why we highly recommend getting your pet tested for heartworms at every appointment. The earlier they are detected, the sooner we can treat your pet and remove them from their system. Call us at 905.597.7373 to book an appointment.

How can heartworms harm my pet’s health?

Heartworms are parasites that live in your pet’s blood stream. They’re carried by mosquitoes, which means your pet is vulnerable every summer. A buildup of heartworms can cause blood clots and long term organ damage, such as heart disease, lung failure and (for cats) respiratory issues.

How do you test for heartworms?

Every time we do blood work, we’re looking for signs of parasites. We know your pet has heartworms when antigens or microfilariae are found in your pet’s blood sample. Antigens are a protein produced by female heartworms and microfilariae are the larval forms of heartworms.

What happens when my pet takes heartworm medication?

Cats and dogs react differently to heartworm infestations. Heartworms can be removed from your dog’s system through injected medication or surgery, if necessary. However, cats can only be treated through prevention. That’s why it’s important to stay up-to-date on their heartworm prevention plans. Preventive medicine can be applied topically or orally. You may even choose to use medicine that protects your pets from other parasites.

On the other hand, treating your dog for heartworm requires more discipline. This process can last about 6 months. In between this time, ensure that your dog is not too active. As the heartworms break apart they could get clogged in their bloodstream and lead to fatal consequences.

Last updated: October 18, 2021


The time has come to begin our reopening process! We cannot believe it has been over a year since we’ve had you all in the clinic but we are excited and eager to welcome you back. Please read carefully below for our updated policies and protocols.


  • Effective October 20, 2021, we will be allowing vaccinated clients in the clinic for doctors’ appointments only. Technician appointments and medication/food pick up will continue to be curbside to control the amount of people in the clinic at any given time.
  • We will be allowing one client to accompany their pet in the appointment. Because we will only be allowing one client in at a time, we will not be able to permit children to accompany their parents. There is a strict one-client rule due to the size of our examination rooms.
  • When you arrive for your appointment, please give the clinic a call at 905-597-7373. A Client Care Representative will either let you know the technician is ready to meet you at the door or will retrieve a phone number if we are not quite ready yet.
  • A technician will meet you at the front door. Please have your vaccine passport/identification ready at this time. The technician will also ask you a few COVID-19 Screening questions before guiding you into the clinic.
  • Face masks are still required to enter the hospital and must be worn properly at all times within the clinic and when interacting with our team members outside.
  • Please sanitize your hands upon entry.
  • Continue the use of credit cards as the preferred payment method.

    We appreciate advance notice for food and prescription refills. Please call 905.597.7373 upon arrival at the FRONT DOOR and a receptionist will be out with your order right away. For faster service, we suggest ordering pet supplies and food through our online store. Delivery is free with purchases over $100.00. It's easy! Just click ONLINE STORE on our website to sign up.


    Monday and Wednesday: 8:00am - 6:00pm
    Tuesday and Thursday: 8:00am - 8:00pm
    Friday: 8:00am - 5:00pm
    Saturday: 9:00am - 1:00pm
    Sunday: CLOSED

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

    - The team at Green Lane Animal Hospital