A dog eating their feline friends foodeither as an occasional treat or even in place of their own foodis not necessarily bad for the average adult dog. When Cat Food Is Safe for Dogs. In fact, for some dogs, like those battling cancer and experiencing weight loss, muscle wasting, and a poor appetite, cat food may be an ideal alternative to many dog foods. Cat food tends to be more palatable, provide more calories per serving, and offer a more nutrient-balanced ...