(KMOV) -- A recent trend has cities across the United States changing the way pet stores do business.
Thirty-one cities have passed ordinances that ban pet stores from selling animals that come from commercial breeders. They are only allowed to offer rescued animals from shelters.
"Dogs are kept in tiny wire cages, sometimes only six inches from their tip of their nose to the cage, for the entire lives,” said Dale Batlett with the Humane Society.
According to the Humane Society of the U.S., puppy mills produce an estimated two-million puppies each year.
"You cannot ban a legitimate business from doing business. Bottom line,” said David Salinas, owner of San Diego Puppy Inc.
While the bans do prevent pet shops from selling commercially bred animals, they do not stop commercial breeders from selling directly to consumers.