People dress up as Snoopy, so why not dress your dog up as Charlie Brown? It’s a good way to win any costume contest. Measure your pet and cut off the bottom of a yellow t-shirt to the length needed. Cut up the sides for the shirt to be the necessary width and cut off the bottom half of each sleeve. Use fabric glue to hem the edges together, cut a chevron stripe out of a piece of black fabric and attach the stripe to the shirt. For smaller pets, cut the front and back pattern for the shirt out of the yellow fabric, glue the seams and attach a tiny chevron stripe.