Because Missouri leads the country in the number of puppy mills, I thought this relevant.
Some thoughts on the matter include:
If the "breeder" won't let you see their facilities, it's probably a mill.
Any dog can have papers if the parents are known, this does not mean they are papers from the AKC or the dog has been properly bred. Some organizations have reportedly been formed to give dogs papers even though they are of questionable breeding. A good guideline is to look for AKC paperwork and possibly the denotation of champion for one or both parents.
NEVER buy dog from a pet store as they are almost guaranteed to be from a mill.
There are a number of rescue centers (like the humane society) and breed specific rescue organizations (like the American Brittany Rescue) which test for temperament, sociability, etc. which would be a much better choice. You may not get a show quality dog, but you'll get a great companion.
There is a wealth of knowledge on the internet or at your local Humane Society about puppy mills and how to avoid them. More information about the suit can be found at
http://www.hsus.org/press_and_publications/press_releases/petland_litigation_sm_031709.html
