M.B.
We have had several cats that preferred the dog food. We ended up finding a cat food that both the cat and dog would like. The inverse (feeding the cat dog food) is not a good idea because the cat's nutritional needs (higher protein, I'm recalling) aren't the same as dogs and it is unhealthy for cats to eat dog food. But, it's okay (provided your dog doesn't have any health issues) for the dog to eat cat food. I recommend you check with your vet.