Snoopy is a
fictional character in the long-running
comic strip Peanuts, by
Charles M. Schulz. He is Charlie Brown's pet
beagle. Snoopy began his life in the strip as a fairly ordinary dog, but eventually evolved into perhaps the strip's most dynamic character — and among the most recognizable comic characters in the world. The original drawings of Snoopy were based on Schulz's childhood dogs, Snooky and Spike.
["Snoopy, Charlie Brown et les autres. L'album de famille de Schulz. ISBN 978-27-3242-681-5]
Character
Snoopy, whose fictional birthday has been established as October 2, made his first appearance on the strip October 4, 1950, two days after the strip premiered. He was first identified by name on November 10. Schulz was originally going to call him "Sniffy" (as described in 25th anniversary book), until he discovered that name was used in a different comic strip. He changed it to "Snoopy" after remembering that his late mother Dena Schulz had commented that if their family were ever to acquire a third dog, it should be called Snoopi.
[Michaelis, David Schulz and Peanuts: a Biography, Harper, 2007, p. 220.] In earlier strips it is not clear who Snoopy belongs to; for instance in the February 2, 1951 strip, Charlie Brown accuses Snoopy of following him, only to be told by Patty that Snoopy isn't following Charlie Brown but merely lives in the same direction.
[The Complete Peanuts Volume 1] Indeed many early strips show Snoopy interacting with Shermy and Patty without Charlie Brown, making Snoopy appear to belong to all of the neighborhood kids, similar to the dog Pete in the
Our Gang comedies, who is everyone's dog.