XS: up to 14" chest, 10–12" back length (Chihuahua, Yorkie, small cats)

S: 15–17" chest, 12–14" back length (Dachshund, Shih Tzu, Jack Russell)

M: 18–20" chest, 14–16" back length (Beagle, French Bulldog, Cocker Spaniel)

L: 21–24" chest, 16–18" back length (Corgi, Border Collie, Sheltie)

XL: 25–28" chest, 18–20" back length (Boxer, Aussie Shepherd, Standard Poodle)

XXL: 29–32" chest, 20–24" back length (Labrador, Golden Retriever, Husky)

XXXL: 33–36" chest, 24–28" back length (German Shepherd, Rottweiler, Bernese Mountain Dog)

Measure chest just behind the front legs.

Measure back from the base of neck to the base of tail.

If between sizes, size up for comfort.

0–6M: up to 17.5" head, 17.5–27" height

6–12M: up to 18.5" head, 28–30.5" height

12–24M: up to 20" head, 33–35" height

2T–3T: up to 20.5" head, 38–41" height

4–5Y: up to 21" head, 44–46.5" height

6–7Y: up to 21.5" head, 48–50" height

8–10Y: up to 22.5" head, 52–55" height

The head measurement is most important for hooded costumes.

If your child is between sizes, size up for comfort and layering.

Fleece fabric has some natural stretch for easy wear.