I always call Nature's Farmacy

They usually have someone on staff who will be happy to discuss what you need.I've called them for everything from holistic flea control to Giardia treatment. I have StarPuppy on CCMplus for her arthritus, plus Greenalina Algae Caps for her heart, immune system, internal health and detox. They all get Digestive Enhancer (Probiotics)

It's my understanding, thatglucosomine ect is great, but you need it in a complex to be most effective. At the minimum it should be a combo of Glucosomine, Condroiton, MSM and Ester C. From what I understand,Ester C is the only vit c that dogs can employ. They manufacture their own c, but ordinary vit c is not able to be utalized. Interesting.

Incidently, I knew my chiropractor had studied animal adjusting, and when StarPuppy started limping and favoring her bad hind leg, she actually would move on three legs. He began adjusting her, and the improvement was remarkable. That was when she was three years old. I was afraid of hip displaysia, but the Xray showed arthritus. She's now ten yrs old, and has been on 4 legs since then. The last Xray, taken around a year ago, showed NO change in the arthritus. It was still there, but has not deteriorated at all in these years.
P.S. sorry, I forgot to add, she's been on the CCMplus ect for these 6 years along with the Chiropractic adjustments.

But I'd just call Nature's Farmacy...They are great to do business with.their # is 1-800-733-4981