There are so many animals in this world desperate for a new home. Puppy mills help fuel the overpopulation problem, and are often poorly regulated cesspools of disease and suffering, especially when these mills are large scale projects. Having had worked in a county shelter for several years, I saw firsthand the tragedy and cruelty that can be brought upon the animals within a puppy mill. The pain I saw in those dog's eyes was unlike anything else I've ever known, and most of the canines were so riddled with parasites and potentially fatal conditions that they could not be saved.
Truly, I hope there is a special level of the underworld awaiting the sick people who run these establishments. (Sorry to get so dark, there. But really, it's horrid.)