Holiday Planning & Ideas Halloween Halloween Projects & Crafts Pet Costumes How to Make a a Doggie Dinosaur Costume All you need for this no-sew pet costume is a T-shirt and some felt. By Madeline Buiano Madeline Buiano Madeline Buiano is an editor at MarthaStewart.com, sharing her knowledge on a range of topics—from gardening and cleaning to home. Editorial Guidelines Published on August 9, 2024 Close Photo: Bryan Gardner Help your pet get into the Halloween spirit by fashioning them this no-sew dinosaur costume, which is made from a shirt and felt. We used a child-size tank top, but you can use any T-shirt or a pet-specific garment that fits your canine. The spiky spine comes together quickly when you use our template, which gets traced onto felt, cut out, and threaded through slits in the shirt. In just a few minutes, your furry friend will have a costume that's trick-or-treating worthy. 16 Last-Minute Costume Ideas for Halloween What You'll Need Materials Template Disappearing-ink pen Scissors One 18-by-18-inch square wool felt T-shirt or tank top Instructions Trace spiky spine template on felt: Martha Stewart Print template. Cut out the spiky spine template. Using the disappearing-ink pen, trace the spikes of the spine onto felt. Cut around the spikes, leaving them attached to the felt as shown. Trace slit template on felt: Cut through the slits in the slit template. Place it on the shirt, and trace lines through the slits. Snip out the slits on the shirt. Pull spikes through the slits: Place the felt strip inside the shirt. Pull the spikes through the slits so they stand up.