You go and hide in the tiger cage, walking on all fours so it looks like you're a real tiger (you are paratically one anyways). You become worried when they ship you in individual boxes but somehow they don't seem to notice the extra tiger.
You spend what seems like hours in the box. It puts an extreme pressure on your hip and feet. Finally, almost after being in the box four 12 hours they let you out into the tiger pen. You're aching and sore. Somehow after all the tests and bloodwork they did when you arived they never realized you weren't a real tiger.
That night after everyone as left you start to plan your escape. You try to raise yourself to your feet but suddenly you fall back on all fours. You back feels different now, it bends over differently from before. Next you try to open the doornoob with your... paws? Your hand's gone, replaced by a completely feline paw.
Creeping over to the pool of water on the far side of the pool you gaze into your reflection and your worst fears are realized. You're no longer a tiger with human proportions, but and actual tiger.
What do you do now?