To follow pattern more easily, circle all numbers I simply purchased a pattern for the dog costume and made it out of white polar fleece. If you have a pooch that needs some duds for the spooky holiday, the Dinosaur Homemade Dog Costume is the costume for you. Small Dog Costume Instructions Envelope Back. See more ideas about dog costumes, diy dog costumes, pet costumes. Measure your dog in the front from feet to top of head (Munchkin is 14″). I decided Rusty needs to be a scary lion for Halloween. Pirate accoutrements complete the costume included in the pattern are a functional pirate hat and belt. All you need is some felt fabric, a bit of ribbon, and a willing pet! This costume pattern is easily adjustable for any size dog and won't take you more than an afternoon to complete.