This Dinosaur Pet Costume is perfect for your best friend! It can be a regular comfy outfit for them when it's chilly out, or for Halloween. It has an elastic hood. Made of fleece. The sizing is a bit smaller than normal, make sure to check measurements. It measures approximately the following: the XS (Chihuahua) is 6.7"-7.5" for the neck, 10.6"-11.4" for the chest, and 7.5"-8.3" for the back; the S (Dachsund) is 8.3"-9.1" for the neck, 12.2"-13" for the chest, and 9.1"-9.8" for the back; the M (Beagle) is 9.8"-10.6" for the neck, 13.8"-14.6" for the chest, and 10.6"-11.4" for the back; the L (Australian Shepherd) is 11"-11.8" for the neck, 16.9"-17.7" for the chest, and 12.2"-13" for the back; and the XL (Golden/Labrador Retriever) is 12.2"-13" for the neck, 18.5"-19.3" for the chest, and 13.8"-14.6" for the back.