Breed good dogs and you'll get good ones. I know all the benefits with smaller dogs, but in the end size don't mean shit. I know smaller dogs are faster and usually is more entertaining. But to see catchweight dogs go at it for 2 hours is something rare and special to me. I can honestly say I will breed the best one i got no matter if he is a 60 lbs dog or a 30. Weights are out there, it' all about if you are willing to travel for it.