You should never dismiss something like that as a "trait" or "that's just how he is". All dogs can be trained. It just depends on how consistent you are.
Toa is 8 months. He mouths but never bites down on me. All dogs do it. I stopped Toa's puppy biting by ignoring him. If he wanted to bite then the game is over. No toy. No play. Then when he calmed down again we could go back to playing. Seems mean, but it works. You have to treat the dog the same way another dog would. They wouldn't stand for it. Sometimes the high pitched yelp worked, but sometimes the high pitch means high energy and gets them even more excited. You have to combine this with ignoring the pup for a bit to get the full effect.
Not sure why someone posted about odour eliminators, but I have to put my two cents in on that too... I tried everything (including nature's miracle) when we had a kitten that peed everywhere, and the only thing that truly got the smell out was OUT! brand. We even rented a carpet cleaner and bought special solution for it and that didn't even get the smell out. But OUT! worked the best for us.
