Had same issue
My dog Shaggy had the same issue. Still going through it with my dog Benji. It does take time and plenty of patience.
First, do NOT pet/rub his stomach and tell everyone else NOT to do it!!! This is the MOST submissive behavior. Once you accomplish this things should change progressively.
Shaggy is a smaller dog so this method worked on him. Everytime he would roll over I would PROMPTLY turn him over to his feet. I would NOT pet him while exposing his belly ONLY on the head/back. I did have to physically grap his tail and head flip him onto his feet. It did not hurt him and would have to repeat the process a few times. Each time I would tell him "No petting belly" or something like that. Later, I was able to just ignore him when he rolled over. This method will need to do continously.
Basically IGNORE the undesired behaviors and PRAISE the wanted ones. I do think eventually the "Attack Strangers" mode will kick in once the submissive behavior is eliminated. ALWAYS MAKE SURE YOU ARE THE ALPHA DOG!!! There will be a point where this could backfire and the dog can try to put dominance on you. Nip that in the bud. The dog will respect and understand that.
I wish you luck. My dog Benji is a Border Collie and her insistance on having her belly rubbed ended up with her paw in my eye! Scratched my eyeball! Once your dog understands it's place in your household it should improve.
Scooby, Shaggy the "Dogs", Ms. Thang the "Cat" and introducing Measley Weasle "The Ferret".
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