A food retainer adapted to receive food to be eaten by a domestic animal. The food retainer has a base and a number of protrusions extending from the upper surface of the base of the food retainer in mutual distances from each other. At least some of the protrusions are substantially higher than the remainder of those on the food retainer. The structure of the food retainer forces the animal to struggle for the food, thereby performing an exercise that keeps the animal healthy and active and stimulates the intelligence and physique of the animal.