Snoopy appeared on the October 4 1950 strip, two years after the first strip. On March 16, 1952,[4] his thoughts were first shown in a thought balloon. On June 28, 1957, Snoopy walked on his two hind legs like a human for the first time.
Snoopy's doghouse, originally depicted in a standard 3/4 view, was soon almost entirely depicted from the side. This allowed Snoopy to use the top of the doghouse to pursue his pretend "careers" - he typed his novels, chased the Red Baron, and talked with the neighborhood birds atop the doghouse.
He was depicted prominently in the last strip that Charles Schulz ever wrote, on February 13, 2000.