ROYAL CANIN Maine Coon Adult food is specially formulated with the needs of this particular breed in mind. You can rest assured that catering to your Maine Coon’s nutritional requirements is just as important to us as it is to you. The Maine Coon is the largest domesticated cat in the world, and its impressive stature is combined with a truly sweet nature. Its solid bone structure and muscular body can make it three times heavier than the average cat. Due to its large size and bone structure, particular attention must be given to ensuring the general health and condition of its joints.