We are not amputating dewclaws from our litters.      The reason for that is there is evidence that dogs with dewclaws have less carpal injuries and because they have a practical advantage there is no reason to remove them.
In fact many search , rescue and performance owners require that there dogs have dewclaws.  For more information and diagrams….http://www.caninesports.com/uploads/1/5/3/1/15319800/dewclawexplanation.pdf