He has always had a protective side. He was very protective with PIG EARS and would growl if we tried to go near, so we took those away.
If he finds human food the kids leave, he will protect it so we try to be good about that as well.
He has always play bitten, but lately it has been more aggressive. We are currently using a muzzle, whenever he growls or shows teeth and putting him in his crate.
He hasn't growled or shown teeth in a couple of days...maybe we are on the mend, cross your fingers...