Snoopy's a nice touch here, although is it just me or does he look like was added as an afterthought? It has to do with his mouth overlapping the ice cream in the last panel.
One of the more pernicious influences of Peanuts is a number of cartoonists who think it's acceptable to make clip art of their characters in all their poses and just paste them into the document. Schulz was far too much of a craftsman to resort to this, but he did admit that he had a number of stock poses he'd most often draw the characters in.
Snoopy's appearance in the last panel here looks like it was just overlaid upon the frame, but I think it's more likely that Charles Schulz just lightly inked the overlaying portion of the cone. If the cone were drawn to the point where Snoopy's snout directly overlaid it it'd be harder to read. You can occasionally see the light inking idea in other strips in the early era, when a character is standing in front of another, for example.