We all know frog doesn't think.
Cats > Dogs > Frogs!!!
The thing is with cats you know where you are with them. They don't give a fuck and they aren't likely to try to eat you except in self defense. Now so called domesticated dogs have been known to turn round and try to eat people because they were bored. There are loads of dogs "destroyed" every year because they maul people and the owners all say something along the lines of, "he's never done that before".
Cat's will kill you given the chance, but they are generally too small to so they make do with stealing your seat and getting food off you regularly. Dogs will kill you and everyone you know when they think you aren't expecting it.