I remember the stories about Son Of Sam and his talking Dog, but I didn't want to know about the idea of an evil talking Dog at the time. Later I read one of the novels, '.44' and as I remember, it didn't have much about the Dog in it.
In a way I'm glad to hear that the Dog didn't tell him to kill after all.
This guy's story always put me to mind of the "Davey and Goliath" claymation. A guy named Dave, a talking dog who rambles on incessantly about God and sin, and those fucking Jickets of course.
That made me pull out a Davey and Goliath DVD I have and I watched the episode Blind Man's Bluff, very good and touching bit of social work! It hit me just right.
He played up the Satanic Panic angle quite a bit trying to get an insanity plea. I’ve read everything available on the man and I think he was a thrill killer that came back from Vietnam scrambled.