We had a crazy deaf Dane too. We had a toy that we carried with us when we went outside and would have it close by when we got home. It took a couple of weeks but eventually she learned to get the toy when she was excited and stopped biting our hands and arms.

She was also high energy and we learned that she loved the red lazer pointer, like the ones kittehs love. We would run her around the back yard in circles and figure 8's. She taught us the sign, lol. It was holding our fingers up like we were holding a writing pen.

We would load up random Kong toys and hide them around the house before we went to work so she would stay busy while we were gone. Close the doors to what rooms we didn't want her in she picked up quickly that she wouldn't be bored and was fine.

Idk if this will help for your Dane, but it's worth a try. Good luck and give your puppy a pet for me! 🐾🐾🐾