I may be wrong in my initial impression but I would also take a close look at how you treat the two of them...obviously being new here I have no idea of your experiences so far (both you and the dogs) though I am trying to read through more posts and to get a better understanding of all these great dogs.
Dogs are pack animals and one willl assume a dominnate position over the others...the people should always, always, always be dominant over the dogs, however they need their own pecking order to be comfortable with their place in their "pack".
I do not agree with lettting dogs fight, but a I've discovered people have a tendency to stop those fights favoring one dog over the other. Usually out of a feeling that they need to protect the less aggressive or smaller one...which leads to more fights because the 'protected" dog feels more powerful and keep challenging the actually dominant dog.
not saying this is the situation, it actually sounds like you're handling it very fairly and overall treating both dogs equally...just wanted to point out the possibility that it's a battle for dominance.
Dogs are pack animals and one willl assume a dominnate position over the others...the people should always, always, always be dominant over the dogs, however they need their own pecking order to be comfortable with their place in their "pack".
I do not agree with lettting dogs fight, but a I've discovered people have a tendency to stop those fights favoring one dog over the other. Usually out of a feeling that they need to protect the less aggressive or smaller one...which leads to more fights because the 'protected" dog feels more powerful and keep challenging the actually dominant dog.
not saying this is the situation, it actually sounds like you're handling it very fairly and overall treating both dogs equally...just wanted to point out the possibility that it's a battle for dominance.