Opinion: You Should Keep Your Dog on a Leash OutdoorsI’m hiking with my three-year-old son when it happens. But I have no control over an off-leash dog, and that’s what scares me. When confronted by an off-leash dog, a horse may respond by trying to flee or defend itself. Shepherd also had a frightening encounter with an off-leash dog while cycling the Moraine Lake Road before it opened to public shuttles last spring. Photo by Jennifer MalloyParks Canada Guidelines for bringing your dog to a national park, a national urban park and a national historic site: