My dog is the same age and has the same problem, except with different triggers. With my dog, is bites if you grab his collar or try to take leashes on and off and stuff like that. I just sat and worked on grabbing his collar over and over again and would click and treat if he didn't bite or if he let go as soon as I protested. He still has his days and moments where he still jumps and grabs at my arms, but overall he's gotten much better. He used to get impatient if he didn't get treats on his terms and would bite just like you're describing, but over time he's learned what will and won't earn him a treat and doesn't do that as much.
Recently I've started to work with "leave it" and am using it with his biting, and it seems to be working. I'd definitely work on that with your dog - it couldn't hurt, and it can be used for other things even if it doesn't work for this particular situation. Plus if he likes being given a job to do and being rewarded, then "leaving" your arm would be a win-win situation.
Also, with my dog, ignoring his jumping and biting was better than addressing it. If I turned away from him or said anything like "No!" it only got him more wound up, so I just hold my ground and wait for him to realize that it's not effecting me and it won't get him what he wants. If he's really wound up and that doesn't work, I get the treats and clicker and do a few commands to get him to settle (because he knows he won't get the treats if he's being a spaz). That usually works with my dog, but every dog is different.
This is just a thought, I could be wrong, but your dog sounds bored to me. If he's bugging you to give him something to do (commands to follow and the treats), then maybe you should get him some of those toys that you can put treats in and it'll give him some mental exercise. That would be great for settings like that concert where he needs to be calm but stimulated.
Edit: I just watched the video in the post above mine, and my dog used to do the same thing whenever I would run. Sometimes he would decide he didn't like the leash and would turn around to chew on it and my hands. A correction on a prong collar has put a stop to that.
Last edited by Namara; 07-14-2010 at 04:35 PM.