What you just mentioned happens with my dogs but without fighting my american bulldog doesn't like me giving any attention to my other two dogs whenever he's around he doesn't get aggressive but whenever i pet one of my other dogs he comes pushes them away with his body and sits on my feet like he's protesting and wont move an inch although all 3 dogs get the same affection and each one of them has their alone time with me in order to be fair and not neglect any of them. couldn't really figure out how to stop him from doing that fearing that one day it could turn into aggression not wanting a fight to break out between my dogs.

I read once online a situation just like yours what the trainer did was get the dogs on down and stay commands went over to the dominant dog 1st gave him affection then goes to the other and does the same while keeping them at a distance from each other on the down and stay command and asked the owners to keep doing this till the aggression is gone or to a lower rate. Not sure if it worked though!

Sorry for the long reply but i do understand you being worried about all what's happening i worry everyday about a bloody fight breaking out.