Pet Costumes & Pet Halloween Costumes. Man's best friend and critters of all shapes and sizes need not miss out on Halloween. But put away your sewing machine trying to shrink last year's costumes, try out these Halloween pet costumes instead. Any costume we can fit you up with, we've got tailored for your lil' pal. From superhero dog Halloween costumes to witchy cat Halloween costumes. Fire-dogs, super-dogs, dominatrix dogs, and everything else in between can dress up your adorable pooch! And since not all dogs are created equal, we have different sizes available, just like for people! With looks is small dog costumes, your little Chihuahua can enjoy the same large dog costumes a Yellow Lab can show off. Don't let your pet's costume options go to the litter box. We can help you dig up the purrrfect dog or cat costume that will let them share in all the Halloween fun, just with different flavored treats.