Quote Originally Posted by Gez View Post
I see the dog didn't stay where it fell, which means it's not really dead. Because dead stuff does not move, outside of zombie movies and spooky scary skeletons. So if the dog didn't remain where it fell, it's because it went away, which means it's alive and well.

Alternatively, because the artist doesn't give a crap about the webcomic anymore and was too lazy to draw it. I honestly couldn't fault her for that if that's the explanation.
Third option - this is a memory, and the dog disappeared because it's no longer the focus of Child-Patrick's attention.