Spiffy is a wild, rambunctious puppy. He first appears in A Tale of Two Puppies. He and his sister Pepper are the last two puppies in the litter left to find homes. Stu wants to keep Spiffy, but Didi doesn't. He trains Spiffy and Didi finally lets Stu keep him.
- Spiffy was named "Spiffy" because he is the son of Spike and Fifi.
- Spiffy is seen a few times in All Grown Up!.