Grab a Halti/Gentle Leader type head collar hon (they also make a chest harness but it's the head halter style collar one we have). They run about $20.00 at any major pet store and I swear they saved our sanity with our puppy, Gunnar. You can keep it on her, put her on a long lead in the house and let her play around. As soon as she tries to play bite just give it a tug and not only will you get her attention, her muzzle with automatically close. Total godsend for us and also makes walking a stubborn, busy and strong dog a dream. They hate them at first but now when Gunnar sees her Gentle Leader halter come out she knows it's time to be good or walk time, she immediately calms down when it's on her face. We got another pup last week and Tank will be getting his own Gentle Leader soon. We have to watch the two pups with our youngest child who is 5. They sort of think of him as another pup so we are very watchful of him and the pups so that nobody gets hurt.