To whomever linked that puzzle:
Argh. I feel as if the solution ought to be this:
http://imgur.com/zIf7fr1

But at the same time, I have a nagging feeling that that's wrong, because the instructions said two square pens, not rectangular.

And again, given that the site is called "Futility Closet" I have a certain suspicion that maybe it's supposed to be impossible just to annoy people.

Also, wolves are social creatures. Why am I isolating them?