I have had dogs my whole life. Two males together is not a good idea. First of all, the farm dog is going to be territorial because that is his home not your dog’s home. Dogs are always more aggressive on their own turf. I have a ranch and entire ranch is high fenced. My dogs would take out any other dogs that would venture on their property. The hair raises up on my female Giant Schnauzer’s back. My Oorang Airedale tucks her body into a crouch position like a panther getting ready to attack. I have a male Airedale as well. My dogs are over 100 lbs and the male is 70lbs more standard Airedale. When I have had two males there has always been fights. Not all the time, but every now and then. They would have to be pulled apart and blood would be flying. My males were always neutered but it did not matter. They would just go at it. The females never had a problem with the males ever. I finally stopped having two males together ever again even though they were kinda agreeable with each other. When the last male died off, I refuse to buy another if I already had one. I think your dogs are too old to be neutered even though a vet would do it. It doesn’t really matter any way they will fight if they just decide to fight. One other story. Had a friend who raised a male Rottie and Dobie together from puppies. They were probably 7 or 8 and she came home one day and one had attacked the other. The chest was ripped out on one of them. The marble just rolls down the wrong slot some days with two males. I don’t know what to tell you other than really watch them together and I would never leave them alone together even though some days they seem fine together. It is a male thing I have learned.
Wasn’t there a building next door was some international or afflilation to another country? Memory is faded somewhat, but I thought was like International blah blah blah