Billy is the owner of B-Dawg, a Golden Retriever puppy and member of the Buddies. Pete has befriended the owners of the other Buddies (as well as kid owners of their parents), due in part to keeping a close relationship with each other despite their separation to individual families across Fernfield.
- Gig Morton played Billy in four of the seven Buddies films, making him the actor with the record for playing one of the Buddies' owners the longest, from 2006-2009. For Spooky Buddies in 2011, Skyler Gisondo, then current voice of B-Dawg, temporarily took over the role, making him the only actor to have played both the on-screen owner and voice of the puppy in the same film.
- Billy has a bigger role in Spooky Buddies.
- He, along with Bartleby, Sam, and Alice, are not in the sixth Buddies feature, Treasure Buddies.