Any breeder who sells to pet stores is not an ethical breeder, since good breeders want to personally interview and educate prospective owners of their carefully bred puppies. (paw-rescue.org)
They are never, ever sold to pet stores or puppy brokers! (champagnekennels.com)
Many puppy mills would not be able to sell to pet stores without a broker's representation. (blogs.bestfriends.org)