Not necessarily fighting, Vega. Some people just have a "thing" about size . . . you know, the "my dog's bigger than your dog" idiocy
The old breeders of fighting lines at least know that when you start breeding oversized dogs you lose a lot of what makes a dog effective. I don't agree with dog fights, but the old breeders did understand some sound principles of breeding. Sometimes you just have to give the Devil his due . . .