This is an old one. I think it came from Michael…
King Arthur’s castle was under attack by a fearsome dragon, so he called for his best knight to slay the creature. But all of the horses were frightened; the best mount they could find was an old, arthritic, one-eyed Great Dane.
King Arthur looked at the dog and announced that he would kill the dragon himself because… “I wouldn’t send a knight out on a dog like this!”