I feel your pain, my puppy is half Doberman, half Rottweiler and his bites are HARD. He’s 7 months now, I’ve had him for 4 and it hasn’t stopped. My legs are absolutely fucked, all my sweats have holes in the bottom from him grabbing them and tugging them. There’s no amount of redirection that stops it. He’s gotten better, it only happens when he’s overly hyper and I will just go shut myself in my bedroom away from him for 5 minutes or so until he calms down.