A few months later it is hard to believe he is the same dog. He sat next to me today nudging my hand so I would pet him and scratch behind his ears. He likes to follow me around the house just to hang out with me. His behavior has greatly improved when people visit. He still doesn't like strangers and will bark and growl at them, but he enthusiastically greets people who are regular visitors - especially when they bring him treats. He even allows one close friend to scratch his ears and rub his belly.
Chuck does have some food aggression challenges to overcome, but he is making progress. If he were an only dog, this would not be an issue. If he were in a home with another dog, the food issue can be managed with training and separate feeding locations. He does have the attitude that he wants to please his human, so he is very responsive to training."