My four month old Aussie is very mouthy. When I try to just ignore him it seems to excite him more and he starts barking and making a growling kind of sound. I'm pretty sure it is not an aggressive growl but it does sound a bit fierce. More like a 'play with me' growl though it is disconcerting.
If I step out of the room and he'll promptly start destroying the couch, a pair of socks, or whatever else he has available. He has toys which are consistently close at hand but because he wants my attention he'll go for something inappropriate. Clever boy. I am very good about praising him when he chooses one of his toys and I am also consistent about redirecting the chewing.
But when he gets wound up he nips, barks, eats the chair, and is generally out of control. When we are calmly playing and he nips I give off a little yelp and he stops immediately and starts licking whatever he bit. This doesn't work when he is wound up though. Do I put him in his kennel when he gets wound up? I don't want him to associate kennel with punishment. I'm not sure what to do.
But anyway not to derail the post entirely, here is what I have found helpful: I stay calm while we are playing, I keep him well exercised, I redirect chewing to one of his toys, I praise him for making good choices (sorry, I have toddlers so we talk a lot around here about good choices) and I yelp short and sharp if he nips me while playing.