For the second time in the last 8 months, something is making the tail of my GSD go "inverse". Instead of the "j" it flips the end of it in the other direction. When he is running or excited the tail goes horizontal and half way drops down almost in a 90 degree angle. It also look like is swollen and the hair puffy. I'll try to post a photo later. The first time it happened after I had been playing with him on my drive way. He was jumping up trying to catch a toy I was holding. So when that happened I though he may had hurt him self and maybe was a pinch nerve. He is 4 1/2 years and for the first time since I have him, I did not run to the vet. After a week or more of resting him, he was fine. His hips are OFA certified and his elbows are also fine (lots of X-Rays in 4 years). Last week he got the strange tail again. A couple of days before I was working him out on my back yard. Regular stuff and also made him jump a 1 meter hurdle several times. From my driveway to my back yard there are some 5 steps and usually he runs and jumps from the top level down, and the is a concrete slab before the dirt. When the tail thing happened again I though: It may be the jumping that had put some load in his spine and that is affecting his tail with a pinch nerve o something. I rested him(5-6 days) but no change. I had take him to the park and play with him a little bit and it does not seems to be hurting at all. I notice that when I heel him sometimes he can not sit (like the tail is bothering him. I had check his tail and seem sensitive. I'm posting here because I have had always good advice, in all areas. Maybe somebody has an idea. I'll wait a few more days if not I will have to take him to the vet. Thanks for your comments and sorry this is so lenghty.