On one of the canine genetics lists someone has questioned why it would "not be possible that commercial breeders are careful to produce healthy puppies", afterall "market forces ... must control the quality of these operations" because "if you have a bad product, the word spreads fast, you get a bad reputation and you are no longer able to sell your product".
One would think (and hope) that would be the case, but in fact most commercial puppy buyers are unaware of the conditions from where pet stores and online brokers acquire puppies.
Here are 14 links that distinguish between the various types of breeders and dog producers and how purpose and goals drive the breeding operations:
Types of Breeders
Evaluating A Pet Dog Breeder
The price of puppies, literally
Hobby vs. Commercial Or Wholesale Persian Cat Breeder
How to Distinguish Reputable Breeders from Any Other Dog Breeders
What Is A Dog Breeder?
Evaluating A Breeder
How to find a reputable breeder
Breeder of Westminster winner Uno has a few words for PETA
How Responsible Breeders Differ from Backyard Breeders and Pet Shops
Stop Puppy Mills - Survivor Stories