Oh I am so very sorry. Hopefully it isn't cancer. Prayers coming your way.

My first foster GSD, Gaylord, had osteosarcoma (bone cancer) and by time they knew he had it, he had to be sent to Rainbow Bridge....They were going to do surgery for hip dysplasia (that's what they thought he had), but when they opened him up...his bones were "mush". They humanely sent him to RB. The cancer spread very quickly. From the time he showed symptoms til the time he went to RB was about 2 months. He was a beautiful soul. We all loved him.

Good luck to you, hoping it is not cancer.
Hugs.