The Market Square Dog by James Herriot illustrated by Ruth Brown*

On a market day in Darrowby, Mr. Herriot and a police officer officer observe a sweet dog begging for food among the stalls.  A few days later the police officer comes to Mr. Herriot's house to ask him to doctor the little dog.  After Mr. Herriot takes care of the dog, the dog recovers in the police station kennels.  No one claims him and no one seems to want to adopt him.  What will become of the gentle dog?
*Highly recommend.
-Borrowed from the library.