Ren and Stimpy, created by John Kricfalusi, are the title characters in the American-Canadian animated television series The Ren & Stimpy Show. Kricfalusi created the characters during his stay in Sheridan College and they first appeared on film in the pilot episode "Big House Blues". Ren is a scrawny, violently psychotic chihuahua, and Stimpy is a fat, stupid cat. They are often at odds with each other on the show, though they do share moments of closeness together.