I don't know much about conformation but it seems like a lot of nice looking APBTs have a slight curve to their backs - regardless if they are stacking or extended. I always thought that a flat topline is desirable for most breeds outside of very exaggerated ones like sighthounds. Is this as common a trait as it seems to me? Is this something breeders look for?
Random pics from the internet; I don't know any of these dogs:
Random pics from the internet; I don't know any of these dogs:



