Snoopy, while born on October 2nd, first made his appearance on the strip on October 4, 1950, two days after the strip premiered and was identified by name on November 10th. Schulz was originally going to call him "Sniffy", 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. 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. 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 via a thought balloon.
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Schulz once said that the best idea he ever had in the strip was to move Snoopy from inside his doghouse to the rooftop.
Royal Guardsmen - Snoopy Vs. The Red Baron
http://www.youtube.com/watch?v=Oxzg_iM-T4E
Snoopy Dancing
http://www.glitter-graphics.com