I have 3 cats, one of which has a hard time with hairballs/puking and possibly teeth. He is very skinny and wont eat much dry food the way it is. All the cats are fixed males, indoor/outdoor and can come and go as they please. Feeding them canned food makes em all crazy and thinking they are getting left out lol. I need a way to feed the special needs cat special food without upsetting the other 2. Is there an oil or flavor that can be added to the dry food to accomplish this? Or does anyone know of another way to go about the feeding issue?