It's a jail break?

An interesting point came up whilst we were debating whatever the hell we were talking about the other day. Can you have a jail break in anywhere that isn't a jail? I believe you can.

Technically a jail and a prison are two seperate things as far as I can see. The main difference being size as far as I can tell. But that is merely a trivial technicality. What concerns me is this:

If you liberate all of the animals in a cat and dog shelter, then is that a jail break? They're living creatures imprisoned against their will in cages. They're fed daily and are given regulated exercise. I've never worked there (or indeed been an inmate...can you call them inmates. It's not as if they can object, but it's nice to know what they're comfortable with), but I suspect they also carry shivs and rape each other in the showers. What more do you want?