Had a possible cancer scare with my 10 yr old border collie x. My vet found a misshapen trachea on an x-ray. Took her to Cornell Veterinary College yesterday and she got a clean bill of health(they figure it is a birth defect that affected the trachea shape). It has never affected her at all-so all is well at our household again. I put her pic below ( even though she is not a GSD, she hopefully will be a GSD puppy mentor soon).