The Maine Coon is the largest domesticated cat breed. It has a distinctive physical appearance and valuable hunting skills. A big Maine Coon cat should have a rather square build, and be strong. Here are some photos of some of the large Maine Coons reported from around the world.
Of course it all begins with diet, and starting from a very early age. Nutrition means growth and your cat will need a full two years before he will achieve his potential growth mark. The enhancer of course is having your male neutered. This is also advised if your family has more than one male cat in the household, as this wards off against male spraying as well. Look for your male to blow coat in winter months and to look much heavier. Please do not place him on a diet at this time, your cat needs this coat for winter months. Continue his normal feeding routines, I assure you your cat is not fat. Might be a bit more lazy during winter months, but definately not due to too many pounds on his bones.