This simple toy mouse has been extensively tested by my cat, Tika. It rolls and spins when batted and provides hours of entertainment. It uses small scraps of fingering weight yarn and knits up in about 30 minutes. It begins and ends with I-cord so no sewing is needed. You can stuff it with catnip, but Tika enjoys sheepy wool scraps. It is also the preferred toy of several small terriers I know.