(ACK, didn't mean to post this one right away, it's kind of out of order and my comment doesn't make sense without the other ones right before it. Still, I love the strip!)
This duck features in another strip in a few months.
Interestingly, Snoopy is the character with the most expressive body language. There are not a lot of poses for the child figures in Peanuts, partly due to their distorted construction. Snoopy, maybe because he's a little more realistically depicted than the others, can adopt more poses.