A puppy mill, also known as a puppy farm, is a large scale dog breeding facility. The treatment of animals at puppy mills is often called into question. Specifically, these commercial breeding farms are known for their lack of medical care, and providing a proper diet for their dogs. The pups often do not receive the exercise and socialization they require at such a young age. Unfortunately, these large-scale breeding facilities also exist for other animals. For example, for cats, a breeding farm is referred to as a kitty mill. Believe it or not, an estimated 4000 puppy mills exist across the United States, which breed over half a million puppies per year.