When establishing whether you are working with a reputable breeder it's all in the details. More often than not reputable breeders will have multiple breeds of puppies/kittens and parents. Occasionally you will have breeders that have only one or two dog/cats that they breed. A reputable breeder will follow state and federal laws as well as an established professional code of ethics. They will also have an established vaccine and deworming protocol and feeding schedule for their puppies. Many breeders will also offer a health guarantee and some breeders will offer health screening on the parents where others do not. This does not determine one to be reputable or not.