Often cartoonists come up with the same idea, it's not plagiarism, it's life.
On a USA site it's called "Cartoon Yahtzee".
I notice that UK Daily Express and Daily Mail both have sheep in flooded paddocks being rounded up by sheepdogs in boats.
Any other examples of this image in your paper? It would seem to be a good gag, just wondered if it was too good not to have been thought up by everyone.