My 8 month old pittie mix nips when he's excited. Usually it goes something like this...we go out in the yard, we throw/chase/roll around over/chomp on the ball and toys (I do the throwing, he does the rest ) and then he gets wound up and runs up to me. He jumps up and nips my arm. He'll continue his pogo stick and nipping routine til physically separated from me or until I pick him up. He's about 50lbs now and I'm not that big so picking him up is fast becoming an option of the past.
Another scenario is when we leave a place like doggie daycare and I stop to talk to anyone. He's fine as long as we keep moving toward the door but he gets impatient and will start to nip if we don't leave soon. He's also done it a few times on leash. He'll grab his leash and then get excited and nip my arm.
I wouldn't call it aggression...it very much appears as though he thinks he's playing and doesn't understand that humans are not puppies. He also sometimes seems anxious or impatient but in those times, it's kind of a different nip...more of a placing his mouth on me and looking right at me to get my attention. Usually the anxious one involves little pressure and the playful one is quick nips that feel like pinches and often bruise. The owner of the place he goes for training seems to agree that it is playing most of the time and possibly some nervousness other times.
We've been working on this from day 1 (since he was about 3.5 months old) and he has gotten MUCH better. We had hoped it would cease after he finished teething but he now has all his adult teeth and it is still a problem. We've worked on self control with him and general obedience. I can now often identify when he is getting wound up and tell him to sit. It's about 50-50 whether he does in those situations though he is very good when calm.
Here's what we've tried: bitter apple spray, timeouts in the crate, picking him up to get him to stop (high success), "no", "ouch", yelping, removing our attention, turning our backs, leaving the room, obedience training, extra socialization, lots of extra exercise, training alternate behaviors, "leave it", using a loud noise to distract and then redirecting, redirecting to a toy (pretty much zero success), NILIF (either a sit or ringing a bell for EVERYTHING). He has had blood tests and a physical at the vet to rule out medical issues but it was suggested to us to try a veterinary behaviorist to address whether it could be anxiety. That's about $500 so it won't be something we can do right away.
Does anyone have any suggestions or success stories? I know that some things will just take time so I'm not sure if this is one of those "be consistent, keep training, wait it out" situations as he is not my first dog but is my first puppy. It's frustrating and a little worrisome (his intent doesn't appear to be to hurt but if he knocks over a kid and nips them, we have a very serious problem).
Any advice would be awesome...thanks!