The vet has been fretting about the X-Rays of Bella's unusual-looking vertebrae, and consulted with several other people. Now they are thinking osteolytic lesions, possibly caused by multiple myeloma - cancer. Getting a better diagnosis would require more tests, of course. And coping with cancer may be difficult.
Last night, Bella's limp was so painful that I just drove her to Safeway, where we slowly circumnavigated just once around the entire property. If it's arthritis, her inflammation might die down at times, but if it's all-consuming, like a wildfire, then we may at the top of a slippery slope.