Dewey Demon's Links
Dewey is treated less as a member of the crew and more as a pet. A very large, very stupid pet. Still, Dewey is extremely loyal. They follow Klaus’ orders to a tee, for better or worse. If Dewey does something “wrong”, Klaus knows it’s because he didn’t explain it correctly. Not that that prevents Klaus from yelling at Dewey for screwing up. He still needs to prove that he’s in control. Klaus never intended to make any sort of alliance with Dewey. Their partnership only got started because the Mirror Temple was in Dewey’s territory, and Klaus wanted it for himself.
To put it bluntly, Spades doesn’t care much for Dewey. She’s never cared much for animals in general, but Dewey is worse. Not only do they have all the worst qualities of an animal, but they also have the worst qualities of a demon. They’re the worst of both worlds, and the only reason Spades puts up with their antics is because if she doesn’t Klaus will get pissed.