Delaware tips the count to 10: A decade of state bans on pet-shop puppy mill sales

Delaware just became the tenth U.S. state to ban the retail sale of dogs and cats from commercial breeding operations — a number that animal welfare advocates say would have seemed unreachable when California first passed such a law less than a decade ago.

According to Humane World for Animals, Delaware's new law closes the state to high-volume puppy mill retailers. Two small pet shops already operating in the state are exempt, but only under current ownership and only if they publicly disclose where their puppies come from.

The ten-state count is the result of nearly a decade of statehouse campaigns that have drawn support from both Republican and Democratic governors and mayors, according to humaneaction.org.

Colorado's ban, signed earlier this year, came with a notable statement from Governor Jared Polis at the bill-signing ceremony.

We are stopping the harmful overbreeding of dogs and cats in terrible conditions in the puppy mill industry, and encourage Coloradans to adopt, not shop, or purchase from a legitimate breeder.— Jared Polis, Governor of Colorado

Six Colorado pet shops that currently sell puppies will have until January 2028 to phase out those sales, according to humaneaction.org. The Colorado effort alone took eight years to complete.

The state laws sit atop a much larger foundation. Humane World for Animals reports that 530 localities across 31 states have passed similar ordinances — a number that includes every major California city when that state's law passed, and 26 cities in Colorado, including Denver, before the statewide ban took effect.

One of the more telling data points from the Colorado fight: 74 pet supply stores endorsed the humane pet store bill, while only seven Colorado stores actually sold puppies, according to humaneaction.org. Advocates say that ratio — ten times more pet businesses supporting the ban than opposing it — undercuts the argument that these laws are anti-business.

The laws target what advocates call the 'puppy mill pipeline': large-scale commercial breeding facilities where, according to Humane World for Animals' own investigations, mother dogs are repeatedly bred until their bodies give out, and puppies are shipped in crowded vans to pet stores where they may sit in small cages for weeks with inadequate veterinary care. The concern is not just welfare during breeding — dogs raised without early socialization and health screening often face behavioral and medical problems throughout their lives.

None of the state bans prohibit pet adoption through shelters or sales directly from responsible breeders. The laws specifically target the retail pet store model, which animal welfare groups argue is structurally dependent on high-volume commercial breeders to keep shelves — and cages — stocked.

Humane World for Animals says it is now prioritizing a similar law in Massachusetts and preparing for local ordinance campaigns in the second half of this year. The organization is also pressing Congress and the Trump administration to strengthen the Animal Welfare Act's commercial breeding regulations — a federal avenue that, if successful, would reach puppy mills in states where retail bans have not yet passed.

Why it matters — Each new state ban removes a major retail outlet for commercial puppy mills, and the 10-state milestone — built on 530 local ordinances — signals that restricting this market has become a durable, cross-partisan policy trend with real momentum toward federal action.

Reported by humaneaction.org, humaneworld.org, aspca.org