This actually proves Dawkin's point. So the boy made the pony, and even though the pony can not see or hear the boy, the boy exists. Gotcha. The boy is supposed to represent the God that created us, the God that we can neither see nor hear. I'm with the cartoonist so far....but wait. The point the cartoon is trying to refute is the "who created God" bit. But....the boy, our metaphor for God in this cartoon, has a verifiable, identifiable creator in his parents, and a well-understood method by which he was created.
The cartoon seems to be arguing that God indeed does have a creator. But if God has a creator, then wouldn't that make him limited and therefore.....not God?
This cartoon argues against itself.