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.

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Information on Heartworm Preventives

Heartworm disease is caused by parasitic worms that invade your dog’s heart and the surrounding blood vessels. These parasitic worms make their way into your dog by infecting the mosquitoes that bite your pets. Fortunately, heartworm disease is preventable using either oral or topical medications.

This blog discusses the different topical medications we offer here at Seneca Animal Clinic to help you decide which prescription will best suit your needs. Please give us a call to further discuss your options and schedule an appointment for heartworm testing!

Nexgard Spectra (afoxolaner, milbemycin oxime)

  • Prevents heartworm disease
  • Once a month beef flavoured chew
  • Treats and controls hookworm, roundworm, whipworm, and lungworm infestations in dogs and puppies
  • Treats and prevents fleas and ticks
  • Available in 5 different sizes (2 – 3.5 kg; 3.6 – 7.5 kg; 7.6 – 15 kg; 15.1 – 30 kg; 30.1 – 60 kg)
  • Safe for use in puppies 8 weeks or older weighing at least 2 kg

Heartgard Plus (ivermectin/pyrantel)

  • Prevents canine heartworm disease
  • Once a month beef chew
  • Treats and controls hookworms, roundworms
  • Available in 3 different sizes (0 – 25 lbs; 26 – 50 lbs; 50 – 100 lbs)
  • Safe for puppies six weeks and older

Revolution (selamectin)

  • Prevents heartworm disease
  • Topical preventive applied once per month to the skin on the back of the neck
  • Kills adult fleas
  • Prevents flea eggs from hatching
  • Prevents and controls flea infestations
  • Treats and controls ear mites & sarcoptic mange
  • Controls American dog tick infestations
  • Available in 6 different sizes (under 5.5 lbs, 5.7 – 11 lbs, 11-22 lbs, 22.2 – 44 lbs, 44.2 – 88 lbs, 88.2 – 132 lbs)
  • Safe for use in puppies six weeks and older

Advantage Multi (imidacloprid + moxidectin)

  • Prevents heartworm disease and treats circulating microfilaria
  • Topical preventive applied once per month to the skin on the back of the neck
  • Available in 4 different sizes (up to 9.9 lbs, 10-19.8 lbs, 20-55lbs, 55-99 lbs)
  • Kills adult fleas and treats flea infestations
  • Treats and controls common intestinal parasites: roundworms, hookworms and whipworms
  • Treats and controls sarcoptic mange

Written by: Seneca Animal Clinic



Senior dog giving a high five to a human hand

Geriatric Care - Looking After a Senior Pet

As your pet gets older, they need to get regular check-ups with your vet to make sure they are fit and healthy. Senior pets are more likely to have health issues, and monitoring with routine check-ups and bloodwork is a perfect way of keeping ahead of any illness.

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Last updated: August 14, 2020

Dear Clients,

Thank you for choosing Seneca Animal Clinic for your pets' veterinary needs. As we continue to adjust to the "new normal," we have implemented new protocols to keep you and our team safe.

It is still preferred that you stay in your vehicle while we bring your pet in for their appointment. However, as of August 14, 2020, we will be allowing one client to accompany their pet during their visit for urgent, new puppy/kitten, or euthanasia appointments.

Should you choose to come in with your pet, we kindly ask that you comply with the following protocols:

  • Our doors will remain locked. Please call us at 416.494.1109 upon your arrival.
  • Face coverings must be worn to enter the clinic.
  • Physical distance with staff and other clients while inside the building.
  • Use hand santizing station upon entry.
  • Continue the use of credit cards as the preferred payment method.
  • Continue with curbside pickup of food and medication (unless you have used our online store and are having your order delivered directly to your home). To place an order through our online store, visit our website and click on "Online Store".
  • If you wish to wait in your vehicle during the appointment, when you arrive, please remain outside the hospital and use your cell phone to call us. We will take a history of your pet's health and discuss any concerns. A staff member will then meet you outside to bring your pet into the hospital for an examination. The Veterinarian will call you to discuss the recommended treatment plan. After your appointment, a staff member will return your pet to you outside, and take care of any needed medications and payment.

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


    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.


    We are OPEN with the following hours:

    - Monday & Tuesday: 8:00 am - 6:30 pm
    - Wednesday: 8:00 am - 6:00 pm
    - Thursday: 8:00 am - 6:30 pm
    - Friday: 8:00 am - 6:00 pm
    - Saturday: 9:00 am - 1:00 pm
    - 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 Seneca Animal Clinic