In a pack, there is always a pecking order, one dog is always higher in the hierarchy than the other, so it is completely natural for males to be fighting for leadership. If one of your boys is showing dominance that is only a problem if that crosses a line. In every situation like this, you have to step in, since you are the unquestioned leader, the highest in the hierarchy. Step in, tell your puppy off, you can even grab him to show your status, and send him away. I know it is hard for your soul, but it has to be done. With this method, you print in different behavior in him and you can make sure that when you are present, they won't fight. Let me tell you an example, Tom's dog doesn't let Sandra's (Tom's spouse) English Bully in the doghouse. As soon as Tom or Sandra is present he immediately lets the English Bully in. If a human is around they are in charge, so no growling or attacking or misbehavior is allowed. We have a blogpost about how a Frenchie parent can become the pack leader, I believe that will be very helpful for your situation. :) You can read it here:  https://tomkingskennel.com/how-can-you-become-your-frenchies-pack-leader/ If you have any question regarding the training of your TomKings Frenchie, please send it to training@tomkingskennel.com and we’ll forward it to our expert!