Katy can't believe it when her parents agree to let her have a dog. And when she meets a lively puppy named Teddy, she's sure her family will fall in love with him, just as she has. But Katy's sister, Diana, is worried about how their cat, Misty, will react to the new arrival. Katy thinks they'll get used to each other, but things don't go as planned. Every time Teddy tries to play with Misty, he upsets her and gets into trouble. Teddy is so sad. Why doesn't Misty want to be friends?