Do not buy a puppy a puppy from other than a reputable breeder. There are millions of dogs destroyed each year by animal shelters because of haphazard breeding. Understand you are buying a breeder as well as a puppy. It takes an experienced Rhodesian Ridgeback breeder to detect dermoid sinus. Your vet will not usually find this.
All reputable breeders sell pet quality puppies with spay or neuter contracts.
Such a clause shows the breeder will always be interested in the welfare of the puppy - for its entire life. Observe the adult dogs in the house. Be sure because this is what your puppy will mature to look and act like. All puppies are cute and lovable, but they grow up to be like their parents. Only buy from the actual breeder of the puppies.