“Don’t feed cats with dog food, but you can feed dogs with cat food.” You’ve probably heard this. Cats need more protein for their dietary needs, while dogs need more carbohydrates. Cat food contains taurine, which is a vital amino acid in the feline diet. Dog food, on the other hand, does not contain taurine, so cats fed dog food will not be able to fulfil their taurine requirements and may experience many problems in their diet, including digestive disorders. In the long term, when dogs consume cat food or cats are fed dog food, this will have negative effects on the health of cats and dogs, as they will not be able to meet their nutritional requirements. Cats have lower water consumption than dogs. We should also keep in mind that breed, age, body size, dietary ingredients and physical activity levels are all factors that affect water requirements in cats and dogs.