Ahh... I made the mistake of embarking with cats. How do I control them? I THINK that you can't assign cats with owners to cages or restraints, so what can I do?
I really don't care if I have to kill them too tantruming dwarves would be Fun but how do I do the deed?
I start w/ 2 and use them for leather/bones/meat - it's not that big a deal (if you stay on top if it, admittedly.) Also depends how many cat lovers you have - look in dwarfs' profile, to see if they "love cats for their aloofness". If you have none, then none have adopted any dwarfs yet and you can take care of it now.
You want to kill all the females - males won't breed, and several males are not a bad thing (they can die, after all).
Go to the z-animals menu, and mark them for slaughter.
If a female is adopted, its trickier - the "owner" will spaz out a bit, but no biggie - you could assign a war dog to them if you're really worried (they'll attack insane dwarfs), or just remove all your Leader's labours temporarily and let them hold a meeting, calm them down. Or put them in a private room with bed and booze see how they react (see below.)
The above suggestions are standards. Another is knock out the pet (via a contrived collapse) and get them into a cage, and toss the cage into some magma - or just crush them with the collapse - the variations are endless.
Once you have no females, you're back in the safe zone - 100 males are no more dangerous than 1 (except to FPS).