Thanks for your reply!! I was thinking it could possibly be and alpha issue. We know a man terribly abused him for the first year and a half of his life. However, he is overly eager to please (the husband) most of the time. Sit,stay,come all of that, he does it on one command where me I (sometimes) have to repeat myself 2 or 3 times before he will do the command.
Even if I physically sit him, his butt will pop back up and we do it again. It doesn't happen all the time, and I do think part of that is his breed, but I am more concerned with the almost split personality he shows towards the hubby. Its like he trusts him but doesn't trust him...at least not all the way.

Yet, when he is in his growly mode and he wants pats at the same time, he will often lie down and expose his belly to both of us, sometimes letting out a small trickle of urine. We have never and will never raise our hand to him (or any of our other animals).
Its like he is telliing the husband to "back off" but "oh pet me please I am sorry for growling."