Many responsible breeders require their puppies be spayed and neutered. These breeders want to prevent descendants of their puppies from misuse by puppymills or backyard breeders. They also realize that spaying and neutering reduces the risk of various cancers. Veteran breeders sometimes own both parents, but more usually do not. Rather, they choose a male with qualities to complement their female, even if that male lives 1,000 miles away.
Most casual breeders know nothing about the health of their dog's relatives.
Skin problems are hereditary and will be a 10-15 year pain and expense for you and your Scottie. Most commercial breeders are unaware of the vWD DNA test, or do not want to spend the money. If a breeder can't tell you lots about these diseases, they will know nothing about other Scottie health problems. You are playing Russian roulette if you buy from this kind of breeder. A simple bill of sale is not a sales agreement.