granted, it's a trust issue, but nonetheless you cannot "force" a buyer to sterilize their pet, i mean who has time for policing?
Something I've always wondered . . . why don't the breeders just have the puppies spayed/neutered themselves and add the additional cost into the price of the puppy? Puppies can be neutered or spayed quite early and recover easily from surgery. I've heard rumors that this will sometimes make a dog more "leggy" and tall than it would otherwise be, but why would the new owner mind since they aren't going to be showing the puppy anyway?