Here are some of our best dog Halloween costumes that you and your pooch will love. When you are all ready to rock your Halloween costume party, it is time you gear your attention towards your little pooch. The best Halloween costume accessory that you could ever ask for is for your furry friend. Not only the best dog Halloween costumes for sale are easy to put on, but they are perfect for every kind of dog – from the larger breeds and the quiet ones to the smaller pups with a little more spunk.