My GSD has always needed to have her claws clipped and ground down. It's around that time fro her to go in to get them ground down again but I noticed that her back claws are extreamly short. Like I just took her in, and her front claws are long as ever. I'm kind of confused. What would cause that? Sometimes I will throw her ball on a paved road, but wouldn't that affect the front and back? I just want to make sure she isn't getting hurt or something. The only new thing I have done is let her swim in our pool. But I don't think thats it because the pool is lined with a double layer of soft plastic padding on the bottom and sides.