Long Dog (and other elongated animals)

Long Dog is the exciting new card game where everyone competes to make the longest dog (or other elongated animal). It's pretty good fun (for ages 9 and under).

In this vague reconstruction of it as an app, simply click on the question mark above to extend (or possibly end) your dog (or other animal). How long will your dog be?

(Single player only, I'm afraid, but if you really want to play it competitively, I suppose you could all open a version of this on your phones simultaneously and try to beat each other that way.)