I wouldn't breed to a dog that doesn't physically exhibit the traits I am looking for... unless of course I have decades of experience with the same exact dogs. I don't care if it has produced previously, that doesn't mean it will produce the same results when being bred to my bitch unless the previous females were bred vert similar to mine. I also do not necessarily believe in breeding to the dog that produced the good dog over the good dog himself for the fact that the sire only provided that good dog with half of his genes. The good dog himself is the only animal that can give you 100% of his genes in the offspring. his father only accounts for 50% of his genetic makeup. weather that 50% is dominate of not in the dog is another story. This is just how I look at it if Looking for a dog or a stud, when you don't have the experience with those dogs. If you have extensive knowledge on the blood it changes everything. but if I don't know shit about those dogs then I want to see the traits I'm hoping will get passed.. so I'm looking for a performer.