Michael Myers step-in jumpsuit costume. IMPORTANT! Not all costumes will fit all pets, consider costume style and animal size; read the Rubie’s pet size chart and watch the sizing instruction video, do not select size based on breed. Combine with people and pet costumes from Rubies for a fun group picture., Rubie’s is the world’s largest designer and manufacturer of costumes – of course they’d remember your four-legged best friend!