since his VF came back negative, and he seems to be doing better, I agree with holding off on the pred. You can always start it if he backslides. I would also look into acupuncture for him. Sugar had a lot of back end problems last fall. The pred (and pain meds) helped short term, but the acupuncture kept her "fixed". Around Thanksgiving, I really thought was going to lose her. By the beginning of this year, she was walking normally, even running a bit in the back yard (she was 12.5 after all ), and eating well, until the end.