Templates for the shapes are available at marthastewart.com. The instructions are simple and yield striking results.Simply attach the legs of the spider to the body, which is just a pair of diamond cut-outs sewn back to back and then stuffed with cotton. Attach the body and the legs to a baby's black t-shirt, which you can put on the dog's torso.
Sharkey, in her moth costume, is looking to fly towards the light. Templates for this costume can also be found at marthastewart.com
Pipecleaners keep her antenae peaked. The fringe is comprised of painted felt strips that are cut into tiny hair-like sections. They are secured to the head with an elastic, which you can customize to fit the dog.