I'm not sure how common it is in shepherds but don't see why it would be much different- if older and stiff, weak abdomen muscles, or genetically prone to something like slip disk. I know more impact on smaller dogs from jumping on couch so forth. But constant repetition of something that can cause stress on a body and can have its effects. My aunts had a small dog around 10 years old constantly jumping up and off couch- causing slip disc. He had surgery and is doing good now. No more jumping on couch for him and he will try.