To keep Binx out of the kitties food, which is on the floor, I purchased some decorative flowerbed 'fences'. They are made out of wraught iron (did I spell that right?), and make a 'cage' around the food, but, the bottom can be sqeezed through by the cats. I ended up not really needing it, as he isn't interested in their food (or their litter pans).

I think it is imperative that you create a safe, dog free, place for the kitty to eat.