Sassy is a 10-month-0ld border collie/terrier mix that has weasel-like tendencies in that she can squeeze through a 5-inch gap in the door and run away. Tugboat can't catch her, but doesn't try anyway. Therefore I have to go after her.
However, she is good at getting Tugboat to play and can be rougher than Digby. It's good for Tug's big heart!