Maybe so. Just as you may take supplements for knee pain, say, your dog's joints could also benefit from an added boost of glucosamine or chondroitin. Even those good fats you take can help your pup: New pet-supplements line GreenDog Naturals offers an omega 3-6-9 product for shiny coats, as well as a complete line of organic supplements. In fact, natural remedies for pets can help treat conditions ranging from anxiety to urinary-tract infections. However, pet supplements are not regulated under the Dietary Supplement Health and Education Act (DSHEA), which makes it illegal for supplements to claim to cure or treat particular diseases. Always be sure to check with your veterinarian before starting your pet on a supplement regimen.