Yes, play growling is hilarious. My chessie did that. We had a game where he'd pick-up a stick and prance around growling. Then I'd grab another stick and immediately he'd drop his and want mine. Then I'd throw my stick, he'd retrive it, and I'd pick up a bigger stick. We keep going like this until finally he'd grab a sapling from the brush pile and drag it, trying to carry the whole tree. Other times he'd go out and come back and wait at the door with these large branches and then become very frustrated he couldn't get them through the doorway.
People may scoff at you, who see not the lightest blade of grass bent by his footfall, who hear no whimper pitched too fine for mere audition, people who may never really have had a dog. Smile at them, for you shall know something that is hidden from them and which is well worth the knowing. - Lord Byron