Our puppy falls ALL THE TIME!! It is almost like her legs get going and her body is a few steps behind and she tumbles and rolls. I dont think she completely realizes that she has back legs yet either. When she starts going up the steps she gets too excited and forgets to bring her back legs up with her and ends up stumbling and smacking her face on the step. My Doberman had done this a lot, too. I think because Dobie puppies have such long legs and it takes them a while to grow into them. My GSD puppy does better when she is not in such a hurry to get somewhere, and like I mentioned my Dobie did this too, so I have not been too concerned about it. I just enjoy it as part of puppy humor.