I wonder how common knowing about the story about the Dutch Boy who saves his village by shoving his finger into a hole in the dike is these days. How common was it back in 1965? And the idea is used several other times during Art's run. Must have been a favorite story of his.
It does look like Hans is writing something in the first panel.
I rarely see dogs in real life not enjoy going outside. I'm sure there are dogs who don't really like going outside but the few I'm around love being outside. They hop around like idiots at the chance to go outside. Kewpie's just built differently, I guess.