An 8-month-long investigation by the Humane Society of the United States finds one national pet store chain is the country's number one supporter of puppy mills.
The undercover investigation indicated Petland has purchased 17,000 puppies from puppy mills, mostly in the Midwest.
The Humane Society says many Petland stores across the country are supporting puppy mills even as they're telling customers that the dogs come only from reputable breeders.
Most of the puppies come from a puppy mill in Minnesota which practices illegal procedures such as cesarean sections and spaying and neutering.
According to Stephanie Shain, director of The HSUS Stop Puppy Mills Campaign, "Petland is perpetuating the abusive puppy mill industry, where dogs are treated not like pets, but like a cash crop. They know that consumers won't stand for the cruelty inherent in mass-breeding facilities, so they make outrageous claims to hide the reality that the dogs came from puppy mills. People have a right to know exactly what they are buying, but the real victims are the breeding dogs who are confined to life in a cage for as long as people are duped into buying their puppies."