Grandpa's Dog

Discussion between Han and Grandpa over the phone:

Han: "How is Sophie doing, Grandpa?"
G: "Oh she's pretty good except when it's cold, she gets real stiff in her joints and comes into the house at night. She likes to sleep on the red couch in Pat's room."
H: "Why doesn't she sleep in her dog house, Grandpa?"
G: "I don't know. I've put in a warm rug and straw but she likes to sleep on the red couch."
H: "Grandpa, then why don't you build her a dog house big enough for the red couch?"