07/15/2026
Did you know that Southern Ontario is home to blacklegged (deer) ticks, which can carry several diseases that affect dogs? Mosquitoes also pose a risk by spreading heartworm disease. The good news is that many of these illnesses are preventable with the right protection.
Tick-borne diseases we see in Southern Ontario include:
🦠 Lyme Disease – Can cause fever, limping, swollen joints, lethargy, and, in rare cases, kidney complications.
🦠 Anaplasmosis – May cause fever, joint pain, decreased appetite, lethargy, and low platelet counts.
🦠 Ehrlichiosis – Less common in our area but becoming more frequently diagnosed as ticks expand their range. Signs can include fever, lethargy, bruising, weight loss, and bleeding disorders.
🦟 Heartworm Disease
Heartworm is spread by mosquitoes—not from pet to pet. The worms live in the heart and lungs, where they can cause coughing, exercise intolerance, breathing difficulties, heart disease, and, if left untreated, can become life-threatening.
How you can protect your pet:
✅ Use veterinarian-recommended tick and heartworm prevention as directed.
✅ Check your pet for ticks after walks, hikes, camping, or time in long grass and wooded areas.
✅ Remove ticks promptly—the sooner they're removed, the lower the risk of disease transmission.
✅ Keep up with annual wellness exams and recommended screening tests.
✅ Ask us if the Lyme vaccine is recommended for your dog's lifestyle.
Ticks can be active whenever temperatures are above 0°C, so they aren't just a summer concern. Mosquitoes are typically active from late spring through fall, making heartworm prevention an important part of your pet's healthcare.
Have questions about the best parasite prevention plan for your pet? Our team is happy to help! 🐶🐱