The puppies and kittens in your local pet store are pretty cute. But knowing where the adorable animals come from can be heartbreaking.

Many animals sold in pet stores come from "puppy mills," large-scale commercial breeding operations that put profit over animal welfare, resulting in unsanitary conditions, cramped cages, and inhumane practices.

A dog rescued from a puppy mill by the South Carolina National Guard. Photo by Maj. Cindi King, U.S. Army National Guard/Wikimedia Commons.

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