If you spot any girls in scrubs walking dogs about Bloor West Village, it's a good bet they're from Bloor Animal Hospital. They take good care of various animals, although my mom's cat wasn't thrilled to come back after he got neutered here--can't really blame him for that, though.
The waiting area here is a good place to chat up other pet owners (and compare critters). They also have a useful bulletin board for pet-related news: lost and found pets, homes for kittens and puppies, that sort of thing.