My Minecraft Creeper Plush Toy with Sound is BROKEN?

I recently got a Creeper Plush Toy for my girlfriend for a Christmas gift. I held onto it and it worked well. All of a sudden the creeper isn't making any sound! I never did anything to it! Did it short circuit? Did the batteries run out? I don't know! It is essential for it to work! It has no openings though! I NEED to fix it or it's worthless! I threw away the receipt because it got wet and I don't want to rip it open cause I don't want to break it! I need answers FAST!