Apart from the very different builds (which is really hard to see in pics), Shelly's front legs are all black with just white paws - and he's got those white "pantaloons" on his back legs. Tuxedo's right front leg is all white, and his front left leg is mostly white - but has a square patch of black that wraps around front. When they were baby kitties living outside, Tuxedo was "white legs" and Shelly was "black legs."
