Dogs starting to Fight?

Put a E- collar on both of them. Put them together & get ready to shock them if they start something. Do it as much as possible but do not leave them alone. You can probably get them to ignore each other as long as you are around. Like said above, separate them.
I got a 3 yr. bulldog in to try for a catchdog. He had never been around other dogs but his instinct was to grab them. I put a shock collar on him & would lead him up to other male dogs & as soon as he would lunge, I would fry him. Took a couple of days but he started to ignore them & once he started catching hogs, I never had another problem with him. He knew his job & that was that. One word of caution on bulldogs tho, once they engage, no shock collar will work. They just phase it out.