If it is not their first breeding, ask if you can call previous buyers of their puppies, to check on their puppy's progress and health conditions. If so, ask to see their OFA papers. Check for cleanliness and general appearance . If they won't allow you to see the facilities, end the interview and look elsewhere. Note - a reputable breeder should answer by saying that they have bred in hopes on creating a better specimen of this breed.
Breeding is a very serious concern, and best left to the ethical and conscientious people.
Many backyard breeders don't even know what the recognized standards are for their breed. These animals are then usually sold to pet stores. This term refers to those with a commercial interest in the breed.