My chihuahua stays on the slim side and actually won't eat everyday. My vet says she is absolutly healthy just picky. She is on Royal Canin Chihuahua food and seems to like it. Some of my friends have 5 chihuahuas and they feed them plain cooked chicken everyday with their meals and they are not over weight and are the healthiest chihuahuas I've ever seen. So I was wondering if it would hurt to add it to her food maybe once a week.