Weewee

A Weewee is a ravenous serpentile creature which lives on the bog planet of Mi Trow'zers. Normally a small and unassuming creature, the Weewee lures its prey into its dwelling cave or large ground hole. It then grows to nearly three times its original size and devours the victim whole.

Han Solo kept a Weewee as a pet for several months aboard the Millennium Falcon. However, he was forced to jettison the creature when one night, his Weewee found its way into Chewbacca's room and attempeted to ravage the helpless Wookiee as he slept.