Up until this scenario, following the Zookeeper Reqs works fine. However, with the Snow Leopards (as everyone has noticed) the Zookeeper says "This exhibit is well suited" but the snow leopards are still cranky.
The trick is the list bar on the Animal Information pane. That's the exhibit suitibility bar. You need to change the exhibit until that bar is green, then the snow leopard (or any animal for that matter) won't get upset.