It's not that Narnia didn't have Dumb Cats, it's just that even the mute ones seemed to have a higher intelligence than they did back in England. If you could talk to them in a reasonable, no-nonsense voice they seemed to get the picture fast enough to get out of your way.

So, when his new roommates found him trying to convince the local mouser to get off his research paper, he only felt half foolish when he said "this used to work just fine on the cats at home."