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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.

Thank you so much for subscribing to A Humane World. We appreciate your commitment to helping fight the big fights to end suffering for all animals! We will send you email updates with the latest posts as they get published.

View the work we do in and throughout India

Your actions will make a difference for all animals. Your messages make a difference, even if leaders don't want to listen. Here's why.

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.

View the work we do in Italy

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.

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

Our Monitoring, Evaluation and Impact Assessment work helps us design and customize humane, effective and sustainable solutions to address companion animal welfare issues at a local or national level.

June 7-13, 2026: Experience the charm of Romania’s landscapes and traditions while supporting vital veterinary care for animals in need.

Animals exploited for leather, furs or other products suffer immensely. You can save them by making compassion your preferred fashion and showing others that wearing animals is simply going out of style.

How does Humane World for Animals, formerly called the Humane Society of the United States and Humane Society International, help animals and people during disasters? Learn more about how your donations support our rescue efforts in hurricanes, tornadoes, wildfires and more.

Step-by-step instructions for finding information about universities, hospitals, companies and other facilities that use certain animals in experiments

Guides and research on companion animal welfare—humane care, sheltering, adoption, behavior, and policy to protect pets and strengthen communities.

Learn how millions of wild animals suffer each year on fur farms and from trapping, and how bans and consumer shifts are driving fur’s rapid global decline.