Our weather is cold in New England. We usually stay around 20s to 30s but every winter a few times we hit single digits. The practice by veterinarians here is year round HW preventatives. Given that the treatment for heart worms is very aggressive and minimally safe, I feel the benefit of prevention year round is just worth it. I think if I were in your shoes, I would be insisting on year-round preventative, despite the Ontario protocol. Protocols are just best practice guides, and can be altered accordingly in the best interests of the dog. In fact, a letter from you and your vet to the OVMA advocating for a year-round protocol might be something to consider.
I am praying for Zoey to recover. Hugs.
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