Every cat I've ever had has shown dogs who's boss whenever they're around.

Size matters not. All dogs have two weak spots:

1. Their soft, wet noses. One swipe and the dog is the cat's ♥♥♥♥♥.

2. Ever see a cat jump on a dog's back and dig in with their claws? This freaks out dogs to no end and they'll try to run off (with the cat still firmly lodged) while doing that high pitched howling/whining thing.

Yeah, cats are awesome. Especially my cats.