My Emma, 10 y/o, has hip and spinal arthritis. She gets Hylasport, 1000 mgs vitamin C and Grizzly salmon oil daily and vitamin E 3 times weekly. Along with the supplements we did cold laser treatments for 2 weeks, 3 x's weekly and twice monthly now. She is doing great and the supplements have helped tremendously. We do have Tramadol on hand for pain, if she needs it. I am not a fan of NSAID's and will not use them.
I switched to g/f foods 2 years ago after Maxx had 2 ear infections in about 4 months. He hasn't had another since then thankfully. I use Earthborn, (Great Plains), in the rotation of 6 different g/f brands. My 2 do really well on it and seem to love it. Hopefully changing food will do the trick!