Puppy Mill Statistics (2026)

Report highlights. Commercial dog breeding facilities, or “puppy mills,” are defined by overcrowding, unsanitary conditions and too little veterinary care. Most of them are not illegal. Federal rules set only minimum standards, many large breeders don’t need a federal license, and the agency that inspects licensed breeders is checking fewer of them than it did in the past. We updated every figure below in October 2026 using the latest reports from Humane World for Animals (formerly the Humane Society of the United States), the ASPCA and the USDA. Most counts of puppy mills are estimates, because no agency tracks unlicensed breeders.

Key Puppy Mill Statistics (2026)

• About 10,000 puppy mills operate in the U.S., licensed and unlicensed (estimate).[1]
• About 500,000 dogs are kept only for breeding in puppy mills (estimate).[1]
• About 2 million puppies (1,997,342) sold each year started life in a puppy mill (estimate).[1]
• 1,912 USDA-licensed (Class A and B) facilities breed dogs for the pet trade. They keep about 108,966 breeding dogs, which produce about 665,781 puppies a year (estimates).[1]
• For every USDA-licensed puppy mill, Humane World estimates there are about 2 unlicensed ones.[1]
• Missouri had 31 of the 2026 Horrible Hundred problem breeders and dealers. It has topped the list 14 years in a row.[2]
• The USDA inspected only 35% of the businesses it licenses or registers in 2025, down from 81% in 2016.[3]
• USDA inspectors documented more than 680 violations at licensed dog dealers in 2025. Not one dog dealer lost a license or paid a fine.[3]
• 10 states and more than 530 cities and counties ban or restrict pet-store puppy sales.[4]
• USDA-licensed breeders now produce about 550,000 fewer puppies a year than in 2020 (estimate).[4]

Puppy Mill Populations

The true population of puppy mill dogs is unknown. Mill populations change constantly because of births, sales and deaths. Most mills are not licensed by the U.S. Department of Agriculture (USDA), so nobody counts them. The figures below come from Humane World for Animals’ January 2026 analysis of USDA licensing data, and the organization labels them estimates.[1]

• 10,000 is the estimated number of puppy mills in the U.S., licensed and unlicensed.
• 500,000 dogs are estimated to be kept for breeding in all puppy mills.
• 1,912 USDA Class A and B licensed facilities breed dogs for the pet trade.
• 108,966 dogs are estimated to be kept solely for breeding in USDA-licensed facilities.
• A quarter of a million dogs and puppies are held in USDA-licensed facilities at any given time, according to the ASPCA.[3]
• Around 2,500 commercial dog dealers (breeders and brokers) held a USDA license in 2025.[3]
• Missouri has the most USDA Class A licensed pet breeders (690), followed by Indiana (401), Ohio (266), Iowa (144) and Oklahoma (113). These counts cover all pet species.[5]

Breeding in Puppy Mills

Most breeding dogs in mills are female. They are often bred at every heat cycle for years, which can lead to health problems; some of these problems may be passed down through generations of their offspring.

• 70,828 is the estimated number of female dogs kept for breeding at USDA-licensed facilities.[1]
• 9.4 is the estimated number of puppies each breeding female produces in a year.[1]
• 665,781 is the estimated number of puppies USDA-licensed facilities produce each year.[1]
• Fully compliant USDA dealers may legally keep dogs in stacked wire cages only six inches longer than the dog in any direction, and female dogs can be bred continually.[3]
• Breeding dogs that fail to sell at dog auctions may be discarded or abandoned, because they no longer have any value to the breeder.[6]

Health in Puppy Mills

Dogs born or kept in commercial breeding facilities show higher rates of health and behavior problems, both mental and physical. Specialists link these problems to poor breeding, malnutrition, lack of socialization and other improper care.

• 33% of the violations the USDA found at dog dealers in 2025 were for veterinary care.[3]
• Common problems in mills include dogs living in their own filth with multiple animals to a cage.
• In a study of more than 6,000 dogs, dogs bought as puppies from pet stores scored worse than dogs from noncommercial breeders on 12 of 14 behavior measures.[7]
  • Pet store dogs had more aggression toward family members, strangers and other dogs.
  • They showed more fear of other dogs and of nonsocial things like noises.
  • They had more separation problems and house soiling.
• Former puppy mill breeding dogs showed more fear, house soiling and compulsive staring, and lower trainability, than ordinary pet dogs.[8]

Common Hereditary Diseases

Improper breeding practices can result in disorders and diseases that may be passed from one generation to the next. Some of these disorders are not immediately obvious; some may not make themselves known until the animal has reached a certain age, which is why people who purchase these animals may not realize right away that their puppy is ill.

• Epilepsy
• Heart disease
• Kidney disease
• Deafness
• Respiratory defects
• Musculoskeletal disorders
  • Hip dysplasia
  • Luxating patellas
  • Polydactyly
• Endocrine disorders
  • Diabetes
  • Hypothyroidism
  • Cushing’s disease
• Blood disorders
  • Anemia
  • Von Willebrand disease
  • Hemophilia
• Eye problems
  • Retinal atrophy
  • Glaucoma
  • Cataracts

Common Communicable Diseases

Puppy mill puppies are more susceptible to diseases, including illnesses that can spread to people. Of the communicable diseases commonly found in mills, the ones that can affect humans are in bold.

• Giardia
• Parvovirus
• Distemper
• Pneumonia
• Kennel cough
• MRSA
• Mange
• Fleas
• Ticks
• Intestinal parasites
• Heartworm
• Chronic diarrhea
• Upper respiratory infections

Death in Puppy Mills

Nobody knows how many dogs die in puppy mills each year. Commercial breeders are not required to report the deaths of animals in their care, and no reliable national estimate exists. What is documented comes from inspection reports.

• Inspection reports in the 2026 Horrible Hundred describe dogs that died without receiving veterinary care for their ailments.[2]
• In September 2025, the USDA cited a Missouri licensee for killing a sick dog herself with a method that “did not meet the regulatory definition of euthanasia.”[2]
• Puppies taken from their mothers too young are prone to illness and death. Federal rules bar shipping puppies in commerce before they are 8 weeks old and weaned.[9]
• Transporters only have to offer a young puppy food and water once every 12 hours, and there is no limit on how many hours puppies may be trucked.[6]
• The USDA removed zero dogs from licensed facilities in 2025, even though at least 200,000 animals (all species) were in facilities with documented violations.[3]

The Puppy Pipeline

The path a puppy takes from birth in the mill to its final owner is commonly referred to as the “puppy pipeline.” For most dogs the pipeline includes the truck (transport), the broker and/or the pet shop or website. Investigations have uncovered abuse and neglect at many points in this pipeline, from improper transportation to unsanitary housing.

• Almost all pet store puppies come from puppy mills, according to Humane World for Animals.[10]
• Petland is the only national pet store chain in the U.S. that still sells puppies. More than 20% of the 2026 Horrible Hundred dealers sold to Petland or its affiliated stores.[2]
• Investigators routinely find ill, underweight, and abused animals in these pet stores.
• Responsible breeders do not sell their puppies to pet stores; they want to meet buyers in person.[10]
• Missouri, Iowa, Indiana and Ohio have some of the highest numbers of USDA-licensed breeders.[6]
• Some mills sell their animals in states where pet-store puppy sales are banned or strictly regulated, usually online.

Terminology

Terms used along the puppy pipeline can be confusing. Animal rights groups refer to this language as “doublespeak” and claim that it is deliberately designed to mislead pet owners.

• A “breeder” may refer to any person who arranges for two animals to produce offspring.
• A “dealer” or “broker” is an individual or organization that buys mill puppies and sells them to stores, to other brokers, or directly to consumers.
• “USDA Class A” refers to a licensed breeder that only sells animals bred in their facility.
• “USDA Class B” refers to a licensed dealer that buys and resells animals.
• “Transporters” are people who move animals from one place to another.

How and Where Mill Puppies are Sold

Puppy mills’ biggest customers are not pet owners. Pet shops, brokers and online sellers buy puppies in bulk. Brokers make it harder for consumers to work out where a puppy came from.

• There are around 250 USDA-licensed puppy brokers in the U.S. (the figure changes year to year).[6]
• Brokers buy most or all of a breeder’s puppies and truck them long distances to stores.[6]
• Puppies are also sold at dog auctions, where hundreds of dogs may be sold to the highest bidder.[6]
• Legitimate breeders are highly unlikely to sell their animals using brokers.
• More and more, brokers are moving online to avoid inspection and transparency.

Online Brokers

Watchdog groups report a steady increase in online brokers, often posing as legitimate breeders or even as animal shelters and rescues.

• Online brokers often call themselves “puppy concierges” or “puppy finders,” using their website to “match” a buyer with one or more breeders.[6]
• Puppies.com, GreenfieldPuppies.com, GoodDog.com and LancasterPuppies.com all featured breeders named in the 2026 Horrible Hundred. Facebook and Instagram are also commonly used.[2]
• Any breeder with 5 or more breeding females who sells sight-unseen, including online, needs a USDA license.[2]

Contribution to Animal Homelessness and Death

Every puppy bought from a mill is a home that could have gone to a shelter dog. Unadopted shelter animals may face euthanasia.

• About 2.8 million dogs entered U.S. shelters in 2025.[11]
• About 320,000 shelter dogs were euthanized in 2025.[11]
• About 2 million shelter dogs were adopted in 2025.[11]
• About 25% of dogs in animal shelters are purebred (estimate).[1]

Are Puppy Mills Illegal? Legality of Puppy Mills

No, in most cases puppy mills are not illegal. In most states, a breeding kennel can legally keep dozens or even hundreds of dogs in cages for their whole lives, as long as the dogs get the basics of food, water and shelter.[10] A puppy mill becomes illegal when it breaks a specific law: it operates without a license it is required to have, it violates state anti-cruelty laws, or it sells puppies where retail sales are banned.

There is no single legal definition of a puppy mill. A U.S. district court described one as a “dog breeding operation in which the health of the dogs is disregarded in order to maintain a low overhead and maximize profits.”[12]

• The federal Animal Welfare Act (AWA) of 1966 sets minimum standards of care for dogs bred for commercial resale. The USDA’s Animal and Plant Health Inspection Service (APHIS) enforces it.[10]
• The USDA licenses and inspects a breeder only if it has 5 or more breeding females and sells sight-unseen, such as to pet stores, brokers or online buyers.[2]
  • Breeders who sell only in person don’t need a USDA license, even if they keep hundreds of dogs.[2]
  • That is why most puppy mills are not USDA licensed, and most of them aren’t breaking federal law.[1]
  • The AWA’s language does not contain the term “puppy mill.”
• Enforcement is weak. A February 2025 audit by the USDA’s Office of Inspector General found that 80% of the dog breeders it studied still had at least one noncompliance, and 95% were not inspected on schedule.[13]
• The USDA had about 80 inspectors for 16,000 licensed or registered facilities in 2025.[3]
• When authorities do shut down a mill, it is expensive: a bust involving 250 animals costs about $500,000 (estimate).[1]
• In early 2026, the USDA signaled it is considering better minimum care standards, including health screening, exercise and socialization rules.[2]

Federal bills (as of October 2026). None of these has become law.

• Puppy Protection Act of 2025 (H.R. 2253) would raise care standards at USDA-licensed dog dealers: solid flooring, no stacked cages, more space, daily outdoor exercise, yearly vet exams and a limit on litters per female. It was introduced in March 2025 with 218 cosponsors, but it has not passed committee.
• Puppy Protection Act of 2026 (S. 4437) is the Senate companion, introduced in April 2026.
• Goldie’s Act (H.R. 349) would require at least yearly USDA inspections, full documentation of violations, and sharing of serious problems with local law enforcement. It was introduced in January 2025 and remains in subcommittee.

State Laws about Puppy Mills

The AWA protects some animals at the federal level, but states can add their own rules for breeders, pet stores and sellers. Humane World for Animals’ July 2025 map of state puppy mill laws sorts states into three groups.[14]

• License and inspect: some states license commercial dog breeders and inspect them regularly.
• Limited rules: some states have breeder licensing or limits on the number of dogs, but no regular inspections.
• No specific laws: the rest have no laws aimed at commercial dog breeders, so only general anti-cruelty laws apply.
• Check Humane World’s state law map to see which group your state is in.
• States that don’t require breeder inspections, or that are slow to answer public records requests, are under-represented in watchdog reports like the Horrible Hundred.[2]

States that ban pet-store puppy sales. Ten states now stop pet stores from selling commercially bred puppies. Pet stores can still work with shelters and rescues, and people can still buy from responsible breeders directly.[15]

Additional Animal Protections

Veterinarians, animal welfare groups and many lawmakers want to end puppy mills, but targeting mills directly is hard because there is no agreed legal line between a puppy mill and a breeding kennel.[10] Lawmakers and animal welfare groups now focus on cutting off the places mills sell to.

• “Puppy lemon laws” in many states let buyers of a sick puppy get a refund, a replacement or reimbursement of vet bills, usually up to the purchase price.[10]
• More than 530 cities and counties have ended retail puppy sales, on top of the 10 statewide bans.[4]
• States are enforcing their bans. New York’s attorney general has sued pet stores under the Puppy Mill Pipeline Act, and Washington’s attorney general case against the Puppyland store ended with a $3.75 million fine.[20]
• More than 3,330 animals have been rescued from Horrible Hundred breeders that closed since 2013.[2]

Report Illegal Puppy Mills

If you see cruelty or neglect, such as sick dogs, filthy conditions or no food, water or shelter, contact local authorities first. Then report the breeder to the USDA and animal welfare groups.

• Call your local animal control agency, humane society, or police or sheriff’s department.[21]
• If the breeder sells online or to pet stores, file a complaint with APHIS using the USDA Animal Welfare complaint form.
• Report it to Humane World for Animals with their puppy mill report form, or email stoppuppymills@humaneworld.org.[10]
• If you bought a sick puppy, contact your state attorney general’s office about puppy lemon laws.[10]

Signs of a Puppy Mill

Some pet owners wrongly believe their animals are rescues. Mill puppies may also be “adopted” through classified ads, online, at flea markets, bazaars and roadside stands. Seemingly legitimate groups may provide bogus “certifications.”

• Puppy mill sellers and brokers may attempt to pass off their dog-breeding operations as an animal rescue organization.
• AKC registration is not a sign of quality. At least 30 dealers in the 2025 Horrible Hundred were linked to the American Kennel Club.[22]
• A USDA license is not a guarantee either. More than half of the 2026 Horrible Hundred breeders were USDA licensed.[2]
• Puppies shipped in commerce must be at least 8 weeks old and weaned.[9] A seller offering younger puppies is a red flag.
• Real breeders do not use pressure sales tactics.

Red Flags Online

Legitimate breeders generally don’t sell their animals online sight-unseen. Unscrupulous breeders will post multiple ads, usually under different names and/or with conflicting information.

• Google the phone number or other contact information for the person selling the puppy. If they are not a reputable breeder they will likely use multiple advertisements or venues to sell their dogs.
• Copy+paste text from the breeder’s website into a web browser. If it appears elsewhere on the internet, check to see if it’s on a duplicate site or ad.
• Check to see if photos of dogs appear elsewhere online. Use a reverse image search to find duplicate ads or stock photos.

Red Flags in Person

Any reputable breeder will be able to demonstrate that their dogs do not come from a mill.

• Insist on meeting the dog or puppy in the home or kennel where they were born and raised. A responsible breeder will gladly answer your questions and arrange for you to meet the puppy more than once to make sure you are compatible.
• Ask to meet the parents. If the puppies’ mother is not present, or the dog that’s presented as their mother does not interact with the puppies, the puppy likely was not bred there.
• Note questions the breeder asks. A responsible breeder will likely ask you many questions to be sure you are going to give their puppy a good home. Some will not release their dogs without performing a background check on the would-be purchaser.
• Request the animal’s full medical history. Do not agree to have them forward this to you later. If a breeder lacks any paperwork or certificates for puppy vaccinations, worming, microchips, or veterinarian check-up, they do not properly care for their animals. If a breeder seems dismissive or unconcerned about any health issues you might see in the puppy or tries to tell you they are typical for that breed of dog, walk away.

States with the Most Horrible Hundred Puppy Mills

Number of dealers from each state among the 100 in the 2026 and 2025 Horrible Hundred reports.[2][22] States that don’t require breeder inspections tend to be under-represented.

Puppy Mill Case Study: First Light Farms, Missouri

First Light Farms LLC in Poplar Bluff, Missouri, is a USDA-licensed breeder named in the 2026 Horrible Hundred. In September 2025 it received a critical violation, the USDA’s most serious designation, after two dogs died. One, a 7-year-old Australian shepherd named Mabeline, had suffered a neck wound months earlier. The other, an 8-year-old Siberian husky mix named Masterpiece, was killed by the licensee using a method that the inspector said “did not meet the regulatory definition of euthanasia.” The kennel’s veterinarian told the USDA she had never been consulted.[2]

In January 2026, the USDA suspended First Light Farms’ license for 21 days. When inspectors came back in February 2026, the licensee did not let them complete the inspection, which is itself a violation. State inspectors visiting in early 2026 were given a different account of Masterpiece’s death and found more problems with veterinary care and unsafe conditions.[2]

A temporary suspension is about as tough as federal enforcement gets. In all of 2025, no USDA-licensed dog dealer lost its license or paid a fine.[3]

Sources

1. Humane World for Animals: Puppy Mills: Facts and Figures (January 2026)
2. Humane World for Animals: The Horrible Hundred 2026
3. ASPCA: 2025 USDA Enforcement Report
4. Humane World Action Fund: More Puppy Mills Are Shutting Down (September 2026)
5. Humane World for Animals: USDA Licensed Pet Breeders by State (January 2026)
6. ASPCA: The Puppy Pipeline
7. McMillan et al., Differences in Behavioral Characteristics Between Dogs Obtained as Puppies From Pet Stores and Those Obtained From Noncommercial Breeders (JAVMA, 2013)
8. McMillan et al., Mental Health of Dogs Formerly Used as ‘Breeding Stock’ in Commercial Breeding Establishments (2011)
9. 9 CFR 2.130: Minimum Age Requirements
10. Humane World for Animals: Puppy Mills FAQ
11. ASPCA: Shelter Intake and Surrender: Pet Statistics
12. 577 F.Supp. 958 (1984) Avenson v. Zegart
13. USDA Office of Inspector General: Animal Care Program Oversight of Dog Breeder Inspections (February 2025)
14. Humane World for Animals: State Puppy Mill Laws Map (July 2025)
15. MSPCA-Angell: Puppy Mill Bills and Best Friends: Jurisdictions With Humane Pet Sales Laws
16. New York Attorney General: Selling Pets in Retail Stores Will Be Illegal (2024)
17. Vermont Act 141 (2024)
18. Colorado General Assembly: HB26-1011
19. AKC: Delaware Governor Signs Bills Impacting Dog Owners (2026)
20. Humane World for Animals: Puppy Mill Laws and Enforcement Are Reducing Puppy Sales (August 2026)
21. Humane World for Animals: Report a Puppy Mill
22. Humane World for Animals: The Horrible Hundred 2025
23. USDA National Agricultural Library: The Animal Welfare Act