Cani Flex Chewable Tablets is a tasty glucosamine nutraceutical for healthy cartilage and joint function in dogs and cats. Each tablet contains 500 mg of D-glucosamine HCl. Chewable Tablets. Give your dog a joint supplement for joint health. Buy Cani Flex chewable tablets for dogs and cats. Also try Joint MAX supplements. It comes in regular, double and triple strength.