The Basic Rules
Most Canadian municipalities require dogs to be fully vaccinated and at least 4 months old before entering an off-leash zone. Spaying/neutering is strongly encouraged, and in some areas, mandatory for off-leash socialisation.
Social Cues
Never enter an off-leash park if a dog is acting aggressively at the gate. Canadian dog park culture relies on mutual respect; always keep your eyes on your dog, not your phone. If your dog gets into a scuffle, the polite protocol is to leave immediately to let the energy settle.