According to cartoonist Bill Wray, John Kricfalusi created the characters Ren and Stimpy around 1978 for personal amusement. He was inspired to create Ren by a photograph showing a sweatered chihuahua at a woman’s feet. Stimpy’s design was inspired by a Tweety Bird cartoon called A Gruesome Twosome where the cats in the animation had big noses. Mike Judge places MTV’s willingness to commission Beavis and Butthead on the success of Ren & Stimpy. Other shows that credit Ren and Stimpy’s influence are South Park and SpongeBob Squarepants. TV Guides has rated Ren & Stimpy as one of the top 50 Greatest Cartoon Characters of All Time.