My cocker spaniel exhibited something very similar to that. They thought it was a pinched nerve and thankfully it's never come back. He was on the heavy side and when he lost weight, things eased up a lot for his back.
Good luck with your dog, I know how hard that is and they are members of the family. You all are in our thoughts and prayers.
Good luck with your dog, I know how hard that is and they are members of the family. You all are in our thoughts and prayers.