Charles M. Schulz Museum - "Happy Birthday, Dear Snoopy..." This strip published on August 28, 1951 is the first time that Snoopy's birthday is celebrated in Peanuts. Snoopy's birthday is also
Amazon.com: Pack of 2 - Peanuts Snoopy & Woodstock Striped Cotton Fabric - 18" x 22" Fat Quarter (Pack of 2)
Snoopy's Thanksgiving – Fantagraphics
Snoopy Tennis Comic Strip' Poster by Peanuts | Displate