Commercial puppy mills produce millions of dogs annually in conditions that cause chronic welfare failure, with breeding dogs spending their entire lives in small wire cages without socialization or veterinary care.
Puppy mills represent one of the clearest welfare failures in companion animal production: adult breeding dogs living in barren wire cages for years, producing litter after litter until they are no longer profitable, then discarded. The welfare cost falls on two populations simultaneously — the breeding dogs who live in permanent confinement without socialization or enrichment, and the puppies who miss the critical socialization window and arrive at pet stores with behavioral and health problems their buyers are unprepared to manage. Legislation requiring pet stores to source from shelters or small responsible breeders — enacted in California, Maryland, and numerous cities — has been the most effective systemic intervention. Consumer education about recognizing and avoiding mill sources, including internet sales that obscure breeding conditions, remains important alongside policy reform.