Did you check on the link NoahsMommy gave you for the poison center?

Re the water bowl and food bowl being empty, I wouldn't like to think that he was trying to eat crayons because he was SO hungry Could you maybe try get a big food and water dispenser so there will always be food and water available, or try to put the cats food up high somewhere, so the dog can't get to it?

How is the cat doing now?