Let me clarify...I am not a breeder. My two yorkies had a litter and I can not keep them. I got my male from a show breeder that sells her yorkies for over $2,000 each and yes, she told me specifically that if I bred him, his pups could not be registered. Her goal for limiting registration on her pups is so that no one else can make money off of her champion bloodline dogs.
And yes, I agree, If a breeder specifically does not want their bloodline to be bred by others, they should spay and neuter before selling.
Thank you for inquiring.