Deb - enjoy the pup. My H really bonded with the kitten we got my D about a year or so after his affair. He's always liked animals, but I can see how his chronic depression got in the way of him bonding with our German Shepherd (now 10) even though he LOVES German Shepherds. He's a fool for the cat now, though, and much sweeter to the dog.
I read somewhere that stroking a furry animal raises dopamine levels in the brain - I really believe the kitten contributed to my D's recovery from her anorexia/bulimia/depression. Hopefully this puppy wil give your H a similar boost (Plus - isn't it nice to think of OW being replaced by a DOG?