The Standard Calico Cat is a cat breed introduced by the Nintendogs + Cats Club Kennel.
3DS: "This well-proportioned kitten is healthy and playful -- and not fussy about its owner."
This breed mostly comes in white with black and orange patches, and white with pale black and orange patches (pastel). The patches come in different arrangements, providing the player with variety to choose from. However, the player may sometimes find a Calico in an odd sort of monochrome pattern (white with patches in two different shades of gray), or you may, for some strange reason, find a brown-and-white or more rarely a gray-and-white kitten with a tuxedo cat pattern. Just like in real life, most of the Calicos are female, so it's hard to find a male.
The primary breeds in Nintendogs + Cats may be Standard, Oriental Shorthair, and Longhair, but there are secondary breeds (breeds combined to form one breed of cat).