There is a behavior that Wolf has that is kind of weird and I have no idea what it means or what he's trying to do/say. Sometimes he will hop up on me or my husband. His tail will be wagging, his ears go back, and he kills us with kisses. We pet him and kiss him back. He suddenly stops kissing and wagging his tail, his ears stay back, and he'll kind of give a low growl. He uses his big nose to flip our hands on his head. If we have our hands on our lap he uses his nose to get under our hand. But he's still doing a low growl. He doesn't seem aggressive and I can put my hand IN his mouth while he's doing it and he'll just spit it out and lick it. Is this a game to him?