Aww, I would not pressure your parents right now, but look up dogs in shelters near you, and check pet finder.com and see if there are any shepherds in rescue you could show them. But before a nw puppy comes into the mix, how old is your mother's dog? How old are you? Will you be going off to college in a few years? And if you mother's dog is untrained, bringing a puppy into the household is certainly not going to make it any better!

Besides these issues, can you take on more responsibility around the house to show them you could care for a puppy? Can you try working with you mom's dog at all?