"You know, I'm thinkin' that I'd like to be a zebra if you're giving me the choice," you say to your humanoid animal captors.
"Can we eat him AFTER he's a zebra?" asked the violent-looking wolf.
"I wish," said the tiger. "But no, he's gonna be one of us now."
They all huddle together again and start chanting out their mystical spell. You don't understand what they're saying but you do start hearing animal noises in the background. Your hand starts changing again, and this time, some of your fingers start fusing and your nails thicken, extend and turn black. You think it's going to turn all the way into a zebra's hoof, but it stops short. You're left with two broad fingers and something like a thumb. That's probably because they're turning you into a humanoid animal like they are, at least for the night.
The same thing happens on your other hand, and then thick, dark lines start slithering into existence along your skin, everywhere you look. You can see the striped pattern that will mark you as a unique zebra forevermore. Black fur starts growing from the dark lines, and white fur elsewhere. You rub your hands gently over your new fur, which is short but pleasant to the touch. The back of your neck feels funny, so you reach around and discover your new mane, which as already grown into long hairs behind you.
Your ankles are suddenly very uncomfortable against the grown, so you stand up on tiptoes to alleviate them. Your new position becomes a lot more comfortable when your toes and nails swell and widen into thick black hoofs for you to stand on. An odd sort of flapping feeling behind you makes you look back and discover your new tail. It's as stripey as the rest of you and has a long, black tassel on the end. All at once your nose and mouth feel strange, as a pressure builds up within them. Soon they're forced forward to stick out in front of you as a long striped muzzle. Your eyes are pushed apart to either side during this process, which stuns you for a second as you have to take stock of your wide new field of view. You can see in almost every direction at once, but your depth perception is funky and will take some getting used to.
The last change you can feel for your new body is your ears starting to perk up and twitch around on top of your head. You bring one of your hoof-hands up to feel them and are surprised by how big and round they are. You decide you like your new ears, because you can hear pretty much all the animals in the zoo with this things, not just the ones which are close by.
They chanting stops and the animals look at their new zebra.
"Welcome to your new life as whatever it is we are," says the tiger.