I'll toss in my 2 cents too, since I was dealing with something fairly similar with Arthur (my 10 wk old rotti). He'll still get a little angry if you try to take your ankle out of his mouth, but he now knows that no means no. Establishing the Alpha is a big thing. Arthur knows *I* am the boss, not him. Now, if he starts getting too "chewy" or "growly" I pick him up, pin him down and get in his face. Sounds a little strange, I know, but it works. I did it with Chloe, when I realised when I got her she was a little dog aggressive. I rolled her once, and she never did it again. Another good anti-chew deterrent is Bitter Apple. I used it with Charlie when I first got him. Chewing on your hand? Spray your hand with bitter apple. Chewing on your ankles? Spray your ankles with bitter apple. Eventually he should learn to associate chewing on people with a horrible disgusting taste in his mouth.

Just a couple of ideas in the short term. I've had to use a behavioralist a couple times, and if you find a certified one they can really help! Good luck and welcome to PT! Keep us updated!