August 28, 1951: Snoopy's birthday

Should this be considered Snoopy's official birthday? I don't think Schulz planned out his characters' backstories in that much detail, really. Does it seem strange to sing "Happy Birthday" for a dog?

Snoopy is a dog of many emotions: surprise, tearful gratitude, and anticipatory happiness.

October 30, 1950: The age before white-out

Notice the hasty lettering correction in the second panel!  I also like how it seems to actually turn out to be Charlie Brown's birthday.