My Best Friend Is a Goldfish — Mark Lee

After arguing with his best friend about which game to play, a boy decides it's time to find a new best friend. So he tries to becoming the best of friends with his other pets. He learns to eat on the floor with his dog, take naps with his cat, and watch the world from underwater with his goldfish. But none of these animals measure up to his true best friend. He may just discover that being different from each other is okay after all.