Oh, they do? I didn't know that! [This is not said in a sarcastic way, btw. He genuinely does not know much about Earth dogs.]

But yeah! I found a couple of pens in my room, and i'm using them to take notes about the castle. [He proudly shows her a couple of pages of notes with a lot of very carefully scrawled words and numbers on them.]

See? I wrote down all the vertical measurements in pink pen, and all the horizontal ones in green.

[It may be worth noting that everything on the page besides the numerals is written in some weird language that looks vaguely Scandinavian.]