Hi everyone Im looking to by a bull greyhound bitch pup soon,at the minute I have a collie whippet greyhound who's 4 and i have had since pup that has done everything iv asked of him for his size and wouldn't part with him for the world,but I am now looking for something bigger for other stuff,I have always liked bull xs just a personal opinion,I want a more racy one that will have the gears to catch,so I would be grateful if anyone has advise for me on good blood lines,what percentage is best,thanks for your time.