So I just adopted a two year old, spayed female from the shelter, and I noticed something about her fur that confuses me-- she sheds a lot more white fur than black fur. She has black patches and a black head on a white body and she'd been here two days when I realised that she hardly sheds any black fur but I practically have a new white carpet of dog fur. I checked her over and she's got no bald spots or anything, so why is this happening? Is it normal?