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Ren Höek is a scrawny "asthma-hound" Chihuahua with a floppy body, donkey-like ears, neon-pink eyes with dark red pupils, red (or sometimes light brown) eyelids, and a fairly long, rat-like, pink tail who often calls Stimpy an idiot ("eediot", to quote the character) and slaps him around, quite literally. Ren is vain, spiteful, hyperactive, abusive, and he has a short fuse (especially with Stimpy). His lifelong ambitious personality is to have huge pectoral muscles. Ren's name is the real name of Kricfalusi's building manager. He was born on Tuesday the 17th, which makes him especially unlucky in Ren and Stimpy.