Sorry if I am a bit harsh or too forward. But I have to say what I must.
I by now means am a pro like the many we have here assisting. But I will say that I have dealt with American Pit Bull Terriers and Staffies for many many years. Never for personal protection but had their discipline.
As far as the dog fight. Honestly, did you think, like so many thousands of people, that you could actually stop the dog from having its own genetic tendencies? To top that, did you reallyt think you could stop this ESPECIALLY being of the same sex?
I mean, mosdt dogs WON'T get along neutered or not with other males even thought raised together. Now you are talking about dogs raised and bred for dog fighting. YOu actually think you can stop them from doing what they think is right in his own mind? What HE really WANTS to do?
Let's not mistake dog aggression with human aggresion. It's NOT THE SAME THING.
Even when I have females with MALES I'd still separate them and kennel them due to the fact that YOU don't KNOW what will spark the next. Food, spot on the couch, toy or whatever.
Drop it and you MUST get real. Separate them unless you are there. If you do and are in the area of a fight then KNOW HOW TO BREAK THEM UP WITHOUT HURTING YOUR OWN DOG. Most people have no clue or don't thihnk their dog will ever get into a fight but when it does, they say "These dogs are bad dogs and are too much for the average person"
But at this point is too late as they have assisted in ruining a breed...
In the state I am staying they are outlawing breeds as I type this. running new bills and such. Why? B/c people think they can change a dogs genetics and when they realize its too much for them to handle they tend to blame the dog and not their faulty skills with training.
About the couch thing. I'd grab him by the collar and give him a word to get the hel;l off. You started a bad habit and now you want it to stop. Well, bad habits are HARD to stop. GIve him a word and boot his rear off. I don;'t care if he's used to it or not. Be strong and get him off. I suggest when its bedtime to use the crate ( a kennel is a crate, airline plastic crate or metal is a crate or a kennel, its the same thing)..
Put them in when you can't watch.
If they get into a fight then he has a gap behind his canines. Slid the break stick in their and twist like a motorcycle throttle. THis will open the jaw enough to release the hold.
Ifd you can't diabhle 2 grown 60lbs dogs with each arm yourself easily with one arm like I can then you have no business having both dogs being a potential risk to eachother together. You are, no offense, too weak to break up a dog fight between 2 dogs that are going full on in the mix and are FULLY mature and pissed off. Youy simply can;t do it. I am 6'3 275lbs, and can push over 400lbs of my chest, and play college football at a major D-1 college. I myself have a hard time breaking 2 dogs. Now if you are no where near this size or strenght (which I doubt, most men aren't) then you have no business having both dogs of such calibur running loose together without help. You simply CANNOT DO IT DESPITE YOUR FEMANINE SAVY HIGH PITCH VOICE. Not even the grizzly aggresive harsh tones of a man cannot break the misdt of a battle between such head strong dogs.
I am almost SURE you can't do it. Another football player was yellig for me when I was sleeping one morning as he was exercising one but the other got loose. hE HIMSELF COULDN'T DO IT. I have to help him out to do what I explained earlier, and then break them loose and kennel until we built stronger sections for the other dog/s.....
YOU CAN NEVER trust them with other dogs. People YES, other dogs, NO.....