I was just reading one of the success stories of a puppy mill rescue that was posted on the website Phred told us about in the Transportation Needed for Cocker topic. It read as follows:

"Her first three months were spent mainly under the bed. The next three months, she started sticking her head out just enough so the dust ruffle framed a cute little bonnet around her face. After a year, she sleeps on the rug beside the bed and romps and frolics with her 'brother' Tzu, Gizmo, every morning."

I would think that puppy mill dogs might be very similar to labratory dogs and that maybe there would be bits of insight in the stories posted on this website.