Ok so I have a 9-week-old male bernese mountain dog puppy. He has been showing some severe signs of aggression. I’ve had many big dogs all my life and have raised 4 puppies (3 goldens and 1 chow mutt). He was the largest in his litter by over 3 pounds. I believe that he is used to being the big dog and that is where some of the problems are coming from. He is biting nonstop (which is normal for a teething puppy) but he takes it a step farther. When he bites too hard I’ll go limp and yelp or yell no in his face but he is unfazed by it and usually starts getting worse. He does a ripping action and starts deep growling and barking longing towards the thought or face. Once he starts he doesn’t stop. He bosses around my pansy 2 and 5-year-old goldens. He will tare at their face bark and steal their toys or bones. They are extremely well behaved and just sit back and watch him confused looking (wish they would growl and put him in his place a little) I’ve been working on a lot of the basics of what you should do but nothing is seeming to work. He is going on 3 walks a day and has long indoor play sessions, when he gets too much I stand up and walk away, I’ve tried the yelping and yelling to try to shock him to stop, I have distraction toys, I’ve been working on commands such as drop it hoping to use it when he starts biting(he has sit down and has been doing well with come and his name), I feed the other dogs before him to show him is pack roll and have him sit and get calm before he receive food. He is going to be a very large dog and I’m worried if I don’t get these behaviors under control before he grows that he could become a legitimate threat. He has drawn blood on multiple occasions already. I’m just not sure how to deal with it and everything I have read on the internet is only giving me the solutions I already know. Which is lots of exercise, positive reinforcements for good behaviors, barking back at him when he bites too hard, etc. I’ve been also working with his food (pulling it away, petting him, sticking my hand in there while he eats) and he is not food aggressive at all. he just isn’t a fan of being told no.I’ve been looking up a lot of different methods to work with this and it’s all been stuff I already knew and have been doing. I’ve contacted the breeder to find out if he had any of these behaviors before we got him. if anyone knows what I could do or what might be a possibility to the cause it would be a lot of help getting new prospective.