I stumbled across this tonight and thought it was excellent advice concerning what makes an ethical breeder. It's a very informative and interesting article and I hope that others find it helpful as well.
Getting a Dog Tips - Checklist for the Responsible Breeder
*It is a GUIDE for puppy buyers. The one thing that I did notice is that they suggest 7 weeks but also to use the Breed Club as a guide as well. The YTCA says 12 weeks minimun.