I'm having a similar problem with Taggart "biting". He doesn't hurt, he just sort of mouths you. Now my problem is that is how Zoee and him play. They are constantly biting and pulling on each others necks. I'm sure he'll outgrow this behavior (he'll be a year old in May), but in the meantime I usually just grab his snout (gently) and give him a firm no (not yelling, just a really low no). Usually I do this a couple of times and he gets it. And this behavior from him is not constant, only when I assume my TV watching position. LOL
I keep trying to tell Zoee not to let him play like that with her, but she just doesn't listen to me.