Here is a list of Toronto Off-Leash Parks
Incase anyone is moving or visiting an
unfamiliar area
I just came across this looking for my own area
City of Toronto: Parks, Forestry and Recreation - People, Dogs and Parks Off-Leash Areas List
Another helpful link to help understand the signage
City of Toronto: Parks, Forestry and Recreation - People, Dogs and Parks - Off-Leash Area Sample Signs