
Anyone who the breeder say's can. They could give pick of litter to the family down the road if they want! :)
We twice got pick of litter from two different breeders. They wanted to breed to improve the breed and they both had waiting lists although didn't have the space for another dog. Because we are looking for show dogs that would be shown well aswell as loved we were given pick.
In one litter we were offerd pick of dog's if interested!
Non of them did we have anything to do with the mating :)
edit: also I think most breeders give priority to show people on the possible show puppies as it's nice to see your breeding in the ring.