I am currently treating my own arthritis naturally with glucosamine chondroitin sulfate, 3 capsules a day. I would guess that the same dosage could be given to your dog, given his size. Best to check with a vet. on dosage to be safe, however. I use Cosamin DS, the brand that was used in research studies (don't waste your money on special pet versions of the supplement). Research from a book called "The Encyclopedia of Natural Pet Care" indicates the following anti-inflammatory herbs: boswelia, bupleurum, devil's claw root, feverfew, & yucca. Best to find a naturally inclined vet. to decide which is best. Acupuncture & acupressure to ST36 & LI11 are recommended, as well. A heated dog bed will provide comfort.