Hmm...only thing I can think of that is causing it is that your dogs nails could be too short. Because the sharp ends of the nails are short enough that they are rubbing the side of her toe. When she is standing, do the nails touch the ground at all? They look REALLY short. Gosh, though, I hate to say they are too short..not a problem I usually see...lol Is she wearing them down that short on her own? Or are you filing them that short? You can try to file them rounder/blunter, to see if that helps..But I would let them grow some if you can and see if the problem doesn't clear up.