Grampa Arnold (David Huddleston) visits Kevin and his family and he comes bearing gifts. One is a surprise for Kevin--a puppy, but Jack doesn't think he can handle the responsibility of taking care of an animal. After an argument with his father, Jack decides that a dog is exactly what they need and asks Kevin to keep him--they name him Buster. Guest Starring: (Gary Grossman) as Kevin's biology teacher Mr. Corey.