We had problems with our weimarener like this. Honestly it sounds like he needs exercise. How many times a day do you walk him and for how long? Dogs need exercise outside of their runs and fences.
As for the shwoing teeth what really helped us with his dominence was making him submit to us. He has bitten both of us a few times and this helped immensly. I saw it on Dog whisperer, I'm not a trainer at all so you may want to ask a professional. but what I did (he didn't listen to me only my husband) was growl back at him and hover over him and he would lay down and roll over and show me his stomach. The times that he didn't do this I would take hold of his jaw (to have control of his head) and stare at him until he looked away. I know it seems inhumane but its not. It's a bit extreme though and was hard for me to do at first but he needs to know your in control not him.
And I would greatly suggest some sort of training. we used the gentle leader head collar for his training and he is the mose loving dog now. its amazing the change we saw in him. I wish you all the luck
__________________ Jess  Mitzy |