I'm so sorry to hear this -
you and Zoey will be in my thoughts and prayers.
Keegan has hip dysplasia - and torn/deeply bruised her ACL's in the last year or so and she is THRIVING by using this pain medication.
http://www.doggonepain.com/ It is all natural so it is better for their liver than Rymadyl and the price is comparable.. You can check it out on the site.

She also gets these http://www.springtimeinc.com/product/88/2
She has thrived with chiropractic and accupuncture and holistic healing/Reiki treatments. ALTHO - I do understand in Keegan's case it is her hips not her spine like Zoey -

thoughts and prayers your way.