Ranger, an 80-pound Great Dane–Mastiff mix, fell more than 200 feet from a cliff after wandering away from his owner during a hike in Oregon’s Santiam State Forest. A two-year-old Husky-Shepherd mix named Kenny dropped off a 150-foot cliff in the state’s Columbia River Gorge. And Gracie the Goldendoodle tumbled off a 200-foot cliff in the same area.

All three …