15 Amazing Facts About Rat Terriers You Probably Never Knew By Allen Abby - Also, remember that were bred to be quick runners and need the space and time to exercise that drive. He can jump high too, so a 5- or 6-foot fence is a good idea. He should wear a collar and tag at all times, as well as be microchipped because if he starts running you’ll never catch up. Please follow and like us: