Puppy mills produce millions of dogs in poor welfare conditions annually, with welfare problems persisting into adulthood for affected individuals.
Puppy mill welfare problems are multi-generational: breeding females live in barren conditions with continuous reproduction, and the resulting puppies suffer early separation, poor socialisation and often genetic health problems from unchecked hereditary disease. Puppies from mills show higher rates of aggression, fearfulness and separation anxiety as adults, carrying the welfare cost of their origins throughout their lives. Legislation banning third-party puppy sales removes the distribution channel enabling mills to reach buyers unaware of the source of their puppy.