There were two "Sam's". One was Sam Carr, the father of the two Carr brothers who were members of the devil worshipping cult. The other was the demon, worshipped at Halloween since ancient times, called Samhain. The cult worshipped Samhain, among other demons. It was Sam Carr's dog, Harvey, that did the incessant, tormenting barking. David actually shot the dog once, to shut it up, but it recovered.
