I hope it's not. Sometimes spinal things can make your hind end weak - maybe it's that.
You might want to give Dr. Browne at Thera-vet a try. She is a vet PT and can do chiro - I told her she could feel Bella but no adjustments unless she asked for each one, and she was good with that. But I wanted her to use that weird chiro sense of where things were. TheraVet - Rochester Rehab, Equine and Canine Health Care
They sometimes get a little nutty with their modality recommendations - like "do everything" but you can scale it back. Interesting: Conditions Treated - Conditioning, Pain Management, Injury Diagnostics, Physical Rehabilitation.
not sure if those lists are exhaustive or what.
Whatever you do I hope it goes well and shows success.