I have two cats about a year old and one full grown chocolate lab. Because of the size of my dog, I have the cats' litter box, food, and water in a room with a sort of baby gate so the dog can't get in and eat anything. However, there is nowhere in the house that we can put the dog's food to keep the cats out of it. My cats LOVE dog food, so much so that they will not eat cat food. I know it is important for them to have certain nutritional additives that are in cat food and can go blind and have serious heart problems if they do not have these as part of their diet. I have tried changing cat food brands and it did no good. I have also tried mixing the cat food with the dog food so they'd at least get a little, but the dog picks through and eats all the cat food, leaving only dog food. My husband and I are not home enough to consistently get on to the cats for eating from the dog food bowl. The dog has become so accustomed to the cats eating from his bowl that when we tried to stop free-feeding him, he would allow the cats to eat first when we give him his food. I know that there are taurine supplements for cats. Is that enough? Any suggestions? Thanks!!