The sizes of the official AKC-recognized Poodle breeds are determined by height, not by weight. Poodles are bred in a variety of sizes, distinguished by adult shoulder (withers) height. The exact height cutoffs among the varieties vary slightly from country to country. The Fédération Cynologique Internationale (FCI) recognizes four sizes of one breed: standard, medium, miniature, and toy. Most owners also keep the feet and face clipped short to prevent dirt from matting between toes, tear stains on lighter-coated poodles and food from matting around the dog's muzzle. Beyond these sanitary requirements, desired clips depend on owners' preferences. Some owners maintain a longer clip in winter than summer.