I've done it with bullheelers game dogs bandogs a Dane and a presa...it was a freaky thing when I didn't know what I was doing.. it goes alot better if you don't freak out, and if your lucky enough to have help, are strong and able bodyed, and know how to use a collar to choke a dog off someone . Being strong enuffto to handle you dog comes into play. But there are equalizers...if you can't hold your dog back with a leash, try a choke chain, if that don't work a pinch collar...
Ok, let's start from the question, are you the undisputed leader of your pack? If you are the boss in the dogs eyes the rest of this is a lot easier, and the chances of a stumble leaving you with big scars or a dead dog(I assume along with broken furniture that's why your so eager to avoid the fight) become slim indeed. You have to make your word the word of god to those dogs...never give a command your not in a position to enforce obedience to outside of an emergency....not for convenience or ease or cause it's a pain in the ass I mean life or death or maiming emergency. Get a long line and practice recalls daily...a month later do it with pinch collar daily..this works on speed...obey without thinking stuff...not mastiffs strong suit so focus on improvement and on training your self to be a dictator as well as the seemingly meaningless repetitions of recall. As a side note if your not engaging in heavy physically labor regularly....no carrying grocery's a few times a week disent count but loading firewood or block all day dose...get a barbell and some weights
.the concrete plastic one will do here....get someone who has a background in strength athletics not a bodybuilder or gym bro to advise you or look up exercises on iron mind, t nation, or elite fits. The three exercises are hang power clean, push press, any form of row or pull up. Do3 to ,5sets of ,3 to 5 ,reps every other day or Evan daily....your not trying to lift alot or to build muscle though you will get stronger very quickly...the idea is to have the body working as a unit so when you snatch up a hundred pluss pound fighting mastiff you end up controlling him and not tearing a rotator cuff....an ounce of prevention as they say...
Next accept that fighting and violence are normal natural things to everything in nature except the sheltered pampered few...and if your raising a pack of corsos you no longer among them. Welcome to the gnosis of mother nature for she is red of tooth and claw. This is not to say you as pack dictator can't break u a fight or a brewing fight with a hard eye and a growl most of the time and with your own bloody claws if talking-to with your mouth wasn't enuff. But it's a fact with these dogs that they are very capable combatants...and when facing a different type of dog they can quickly kill it Evan without that being there express intention( most sight hounds scent hounds and small dogs excepting working terriers and fighting breeds and large ones not of the bull and mastiff types the wolffrusher type/Transcaucasian land race, the white mountain dog type or the rotten she snauxzer pincher type or heavy hounds like plots or gascons) and Evan well put to gather dogs can be killed or injured in a fight with some individuals....but Evan with corsos, or fill in the blank similar type bandogs ,pressa, rottie, the average dog of that breed can't QUICCKLY kill another of the same breed from similar quality stock and age size ect. (not saying male dogs don't eat pups or the aged can often go out in a fight they'd have shrugged of a few years before,)
In other words ...you have time to break it up ....lots of time....the dogs that are the best at killing other dogs of similar age sex and weight in a confined close combat such as in a house are American pit bull terriers...it is a quick fight if it's over in half an hour...usually you got times over an hour ...all the way up to four hours once...and that's not necessarily to the death just till one corner is convinced they've lost or one dog quits fighting. Now if you had golden doodles that would be irrelevant...but pits and corsos and all the other bull and mastiff breeds got tough and durable long before gabon Trajan set down the Cajun rules. There tough because there the descendants of the broad mouth dogs sinse man and dog formed there partnership...another dog can't often kill them wickly....you have time.....learn to use a breaking stick to remove a dog from a bite, and if you grip the collar ...wiggle it up as far to the front of the neck as you can before rotating hand while maintaining grip to construct blood flow to dogs brain it will release bite in 30-60 sec.you should be prepared as it may go all the way unconscious leaving you with alot of dead weight in a possibly awkward position. You can use it's neck kin instead if your strong enuffto and don't mind a bite...it won't put them all the way out to grip skin and twist though.
It's better to have a strong collar on them,..leather or nylon or canvas...last two must be multi ply no pu leather or plastic no matter how bad ass it looks...no wolf collars or 2",agitation collars., That makes this trick almost impossible. If you strongly and forcefully separated a fighting pair a few times they often will stop fighting before you crank the collar round in anticipation...before I knew the collar truck I would try every thingincl.puting water hoses in mouth and noise, pepper spray,.beatings ...but the best besides the collar truck is stretch em with one or more back legs and use pry bar top ry open jaws while maintaining backward pressure as well..doing this to two dogs a a time is difficult and when using this method a kennel hand is recommended..
The other thing is perhaps it's ok to just let them fight ...violence dose settle stuff ...they might need to go out back ...you study your pack dynamics and you make that call.....just let them fightdosnt apply to the neighbors spaniel or lab...not same type of dog not same level of resilience and rugged construction ...it will be taken apart.
Don't"fix" your dogs it's crazy and bizzare...people going around worrying about Crop and dox , then turn around in same snotty tone tell you to hack is nuts off....it's like people being in favor of animal control and dog shelters but hating dog fights....kinda silly
Desexing a dog won't render it unaggressive or make it stop marking but it will ruin it's drive and focus and cause many more health problems than it eliminates...at the very least wait till 2_3 yr old when the dogs matured...fixing retards or stops development...makes them have little heads smaller brains thinker more porous bones ect ect ect....Bob barker was wrong ...or more likely he just cares more about shit from a stray dog on his loafers than he did bout helping anyone... just a fact on that fool he made millions taking advantage of the pows in the prison industrial complex. Leave your dogs sex organs alone! If you can't keep them up ....really! I'm 17 years in and not one maybe baby.