I will try that. Thanks. Today, he was chasing Indiana (just like he was playing with another puppy). The cat never hisses or claws him. Indiana ran up behind Lucky (the cat). Lucky tried to run but Indiana had his tail. He pulled, Lucky pulled. Lucky got away, Indiana got a mouth full of black hair. Looked like he had grown a beard on his pretty white face. Lucky came right back for more, so I guess it didn't hurt. I scolded him for doing it, but he just looked oblivious and looked at me more like I was in his way of seeing where the cat was.
His play biting is frustrating. I know all puppies do it. I have been turning my back to him and stopping play when he does it. He just waits and comes back for more rough play. Then I put him in his pen for awhile if he continues. I know he will grow out of this mouthy stage, it's just that his teeth are like needles. You never know when he's going to sneak up and take a munch on your toes! lol
I don't know what made me think of "park it." Giving him sliced cheese has been the biggest motivator. He likes that more than any other treat so far. Giving him treats when he potties, worked well. He started asking to go out. And when he gets cheese for a treat, he does his "business" pretty quickly.