Woodstock is a major animal character in the Peanuts comic strip by Charles M. Schulz. He is best known as Snoopy's sidekick. He is named after the 1969 music festival in New York state. He first appeared in Peanuts in 1966 but did not have a name until the early 1970s.
It's Spring - yellow bird Woodstock of Snoopy/Peanuts fame: The first bird that bore a prototypical resemblance to Woodstock visited Snoopy in 1967, and this is generally considered his debut, though Schulz didn't give him a name and establish him as a full-fledged character until June 22, 1970. Schulz acknowledged in several mid-70's print and TV interviews that he took Woodstock's name from the rock festival.