The crossword solution for the term REN, TO STIMPY is PAL, which stands for 'PAL of Stimpy'. Ren and Stimpy are two characters from the popular Nickelodeon cartoon series of the same name. Ren is a scrawny, short-tempered Chihuahua and Stimpy is a dimwitted, happy-go-lucky cat. The two characters have been best friends since the show's debut in 1991 and their friendship has been a major plot point throughout the series.