
Yep it is OK for dogs to have Cat food (much more expensive to feed it though), but may be a bit nutreint dense for a sedentary dog and you woudl ahve to feed less.
Dog food is not nutritious enough for cats who are obligate carnivores. Soem manufacturers are adding Taurine to dog food now, it may nto be essential to dogs but is benefitcial for the dog to have a wider range of amino acids.