Whoa, yeah, no. Plagiarism or not, I'm not inclined to take the author seriously after that.

I also wonder, is it really plagiarism? What is anyone supposed to say and do when they discover a break-in, cartoon character or not? Nor are there any Sally Forth children worried about the fate of their stuffed tigers. This is the real point of the Calvin and Hobbes panel, and it's not even hinted at in the Sally Forth panel.