Shadow by Ellen Miles

Puppy Place, now streaming on Apple TV+, based on the hit Scholastic book series! Welcome to the Puppy Place--where every puppy finds a home!Charles and Lizzie Peterson know a lot about puppies. That's because the Petersons are a foster family for young dogs. Someday, they will have a puppy of their own. Until then, they keep busy helping special puppies find homes. When the Petersons meet Shadow, they know he is very special. He is a cute black Labrador retriever, and he is extremely smart. Everyone agrees that Shadow deserves the best. He will be the perfect puppy for someone. But who will be the perfect owner for him?
 
- Goodreads Summary