We had a cat once who walked about 10 miles, across the Colorado River, on the onlybridge available to it, to return home.

My grandfather gave a family dog to a ranch when townies teased it too much. It came back. Mom used to say over 100 miles away, but I think it might not have been that far. Anyway, they sent it back to the ranch, keeping it on the floorboard of the car, at night, so it couldn't see where they were going. A year later, Granddad was outside when up walked the dog, a lot thinner and hungry. They didn't send him away after that.