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The Horrible Hundred report is a list of known, problematic puppy breeding and/or puppy brokering facilities. It is not a list of all puppy mills, nor is it a list of the worst puppy mills in the country, but rather a list of dog breeders to avoid.

Humane World for Animals, formerly called the Humane Society of the United States and Humane Society International, presents the following reports on puppy mills for reference by animal advocates, members of the media and researchers.

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Humane World for Animals has submitted its REACH revision position paper with recommended concrete policy actions to help pave the way towards science without suffering. Read our full position paper. 

Humane World for Animals has carried out undercover investigations around the world to reveal the realities of the fur trade, and no matter where the fur comes from, animal suffering is constant. 

Wearing fur or fur trim is cruel and unnecessary, especially when quality faux-fur alternatives are almost indistinguishable from the real thing.

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How your donation is used to help animals in need after disasters and to support rescue operations from animal cruelty and abuse.

Humane World for Animals makes change at scale, advocating for policy change at all levels of government and working with companies so that they can be kinder to animals their businesses impact. We work in partnership with communities, bringing diverse expertise to the most complex issues and doing it all with a compassionate and welcoming approach.

Articles, fact sheets, reports and other materials to help professionals in the animal welfare field.

Explore Humane World for Animals’ resources on ethical tourism—reports, guides and tips to help travelers avoid animal cruelty and support humane travel.

A curated list of resource libraries from leading animal welfare and conservation organizations. Access expert research, educational materials, and tools to support humane initiatives worldwide.

Discover a hub for global laws, enforcement tools, and cruelty prevention resources—all designed to empower advocates, law enforcement professionals, and policymakers.

This resource highlights curricula and manuals for lesson plans and teacher training, plus instructional materials on child safety, animal welfare, and empathy-building across classrooms and communities.

Learn humane animal control and management strategies—community‑based, data‑driven approaches that protect public safety, reduce cruelty, and improve animal welfare.

Community engagement strategies that strengthen animal welfare—outreach, partnerships, education, and volunteer programs that build safer, kinder communities.

Millions of dogs, monkeys, mice and other animals currently suffer in U.S. laboratories. But non-animal alternatives will one day completely replace experiments on animals. This will be a game-changer not just for animals, but for human health.