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, 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 Snoopy. 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. Indeed many early strips show Snoopy interacting with Shermy (who is shown in one early strip running with Snoopy on his leash) 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.
Snoopy was a silent character for the first two years of his existence, but on May 27, 1952 he verbalized his thoughts to readers for the first time in a thought balloon; Schulz would utilize this device for nearly all of the character’s appearances in the strip thereafter. In addition to Snoopy’s ability to “speak” his thoughts to the reader, many of the human characters in Peanuts have the uncanny knack of reading his thoughts and responding to them. In the animated Peanuts films and television specials, Snoopy’s thoughts are not verbalized; his moods are instead conveyed through growls, sobs, laughter, etc., as well as through pantomime and foreign languages. The only exceptions are in You’re a Good Man, Charlie Brown and Snoopy!!! The Musical, in which Snoopy’s thoughts are verbalized through voice overs (by Robert Towers and Cam Clarke, respectively). Animation producer Bill Meléndez voiced both Snoopy and (eventually) Woodstock in numerous television specials from 1965 to 2006. He does however shout “HEY!” in It’s the Easter Beagle, Charlie Brown before dancing with some rabbits.
from : wikipedia.org