Plum loves everyone. She loves her mummy and daddy and she especially loves her best friends, Rocket, Esther, Bean and Jakey. Her favourite part of the day is when she chases her best friends around the park. But when new dogs try to join in, Plum isn't so sure. Do they really need new friends? Especially ones as big as Otto, as old as Bounder, or as tiny as Milly? In this heartwarming tale, Plum learns what it really means to be a friend and how much fun new ones can be - especially when you give them a chance.