Jim Manson said in rec.pets.dogs.behavior:

I forgot to mention that he is physically in great shape
now and extremely cute. He's a miniature and weighs about
16 pounds.

Chip away at his issues - you've taken on a very commendable
project. As you've realised, the key training method at this
point is patience.

Fairly important and something I didn't see in your original
post: How does he get along with other dogs?

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--Matt. Rocky's a Dog.