Hi GoldenAngel .... Just now saw your post. While not Toronto, there is an oncologist at Veterinary Emergency Hospital and Referral Group in Oakville. Our Bernese Mountain Dog Louie is undergoing chemo at the animal hospital and sees Dr. Gauthier. I will post the URL just in case you want to call them for a second opinion:
http://www.vetemergency.ca/docs/vspecialtiesON.html
Take care,
Pat