Bunny and Guinea Pig Costumes Get ready for cuteness overload! With our newest collection of small pet costumes, you can dress up your guinea pig, bunny or other small pet in spooky or festive seasonal ensembles. Find Halloween costumes to match your pet's personality. Is your guinea pig a busy bee, a melodious mermaid, a unique unicorn or a pumpkin? Find Halloween classics for your pet rabbit, ferret or hamster as well, including pumpkins, witch hats and more. We even have a caped crusader outfit for your little super hero! Shop our selection of clothes and costumes to discover fun, new outfits for all of your small pets.