Reputable dog breeders raise their animals in humane conditions, provide good socialization and often formal training, and adhere to the breed standard. They are knowledgeable about major health problems associated with their breed, and with the principles of genetics, frequently undertaking specific matings to produce or refine particular desirable characteristics in their dogs. Less than scrupulous breeding operations, known as puppy mills, may provide less attention to genetics, prenatal care, and nutrition, and often produce puppies which are improperly socialized and in poor health.
