Natural Pet Supplement. With Ester-C. Easy chewable. Wheat free, dairy free, no artificial colors. PetGuard Joint & Hip Care is a unique formulation of nutritional factors important for joint health and support. Because dogs may not manufacture optimal amounts of Vitamin C, many veterinarians recommend supplementation of this important nutrient to maintain and support healthy connective tissue and joint structures. Non acidic ester-c calcium ascorbate is a natural form of Vitamin C that allow tissues to efficiency absorb and retain high levels of Vitamin C without worry of stomach upset. Made in USA.