"No, I have not. Some animals it is... harder to maintain control - a certain instance of an ally turning into a moth and being distracted by curtains comes to mind. But cats are fairly intelligent."

Frumpkin's tail flicks - yes, he knows he's being talked about. "There are minor fae that allow themselves to be contracted into the service of a wizard as familiars. We have a connection - I can see what he sees, and issue commands to him mentally. He needs neither food nor water, and if I use the spell that I cast to summon him in the first place again I can change his form. It takes an hour and specialized materials, though." His ears flick back in slight annoyance. Being a wizard is expensive.