This is a question I have been meaning to ask for a LONG time, but was reminded by Blackmask's excellent post in another thread. If you have a stud dog (obviously not a bitch, they can only have limited numbers of litters) and say he is just so awesome that everyone and their friends want to breed to him. Obviously he has his faults and weaknesses, but let's say they are very minor, and he is just an all around excellent dog. How many litters would you limit him to? If he sires too many, he will have a huge impact on the breed and change it for the better or for worse - maybe both. I, personally, do not think any dog should have that kind of impact. It seems extreme to me. Although if you have a different opinion feel free to discuss, I'd love to hear it! Also, we are assuming you are an ethical breeder and won't breed to just any bitch, only high-quality ones.