Has a contract stating conditions each dog must meet in order to be bred. Contract states that pet quality dogs are to be spayed or neutered. Will allow you to tour the premises and meet the mother. Conditions should be sanitary and ideally indoors. The mother should be friendly and no excuses should be made on her temperament.
Some breeds are notorious for being suspicious of strangers.
Should have and display full pedigree, information on the father, and a reference list of people with puppies from previous litters. Often does breed rescue or is at least familiar with the local breed rescue.