It always amazes me that in this day and age, the the age of information, people can still be ignorant or, worse, in denial about puppy mills. There is no such thing as an ethical breeder who sells their puppies in pet shops. period. No discussion. Backyard breeders are a whole different story – those are small-scale puppy mills who sell on the internet. Bottom line – buying a purebred puppy from anyone, anywhere is very rarely a good idea. I have seen more heartache and sick puppies than I have good experiences with purebred puppies in my career. This article covers puppy mills pretty well, and is very current!
http://www.chicagonow.com/raining-cats-dogs/2013/07/naperville-petland/