Fitness is fitness yes, but on the other hand a boxer in top physical condition won't be able to touch along distance runner on a off day..
yeah but we are not talking about boxers and long distance runners are we,we are talking about dogs you forget we are not talking about pure bulls or pure collies competing you forget half the make up of either cross or more is made up from a sprinting dog both the greyhound and bull are athletes in the dog world a collie is a herding dog with a good brain, a bull is a game as hell package of raw power and does not know when to quit,a collie has endura