Euthanasia of unwanteds or imperfects is common in breeding. One of the biggest is the culling of rhodesian ridgeback puppies if they're not born with the birth defect that causes the ridge. Rotties are still culled if born red or longhaired. The culling results on predictable living puppies, and thus we have the reputable breeder.So sad, breaks my heart to hear of breeders putting down 'imperfect' puppies. Deaf/blind dogs can be trained and seem to be even more loving, if possible, than 'normal' puppies. Maybe because they have even greater focus on us????