Besides the homeopathics ARTHRO-IONX or PROMAXOL, I would also use PROBIOTICS, OMEGA 3,6,9, and curcumin for spondylosis. Another thing that can help reduce inflammation is to feed a grain free diet. According to Chinese food therapy, if your dog tends to be quite warm and seeks cool places, a cooling diet would be helpful. The protein sources would be fish or turkey. Beef is neutral. Warming ones include chicken or lamb and would be good for a dog that seeks warm places to be.
In addition veterinary chiropractic is usually helpful even with spondylosis. Please let us know what happens and if the neves are responding normally.