Size Guide

Size Guide

Use the charts below to find the right fit. All measurements come from the manufacturer for each item.

How to measure your dog

Back length. Measure along the spine from the base of the neck, where a collar sits, to the base of the tail. This is the most important measurement for costumes and full-body outfits.

Chest girth. Measure all the way around the widest part of the chest, just behind the front legs. Keep the tape snug but slide two fingers underneath.

Neck. Measure around the base of the neck where the collar naturally sits.

Weight. Many items list a recommended weight range. Use it as a cross-check alongside the measurements, not as your only guide.

General guidance

  • Measure your dog rather than relying on breed averages. Two dogs of the same breed can vary a lot.
  • Measure while your dog is standing, not sitting or lying down.
  • If your dog falls between two sizes, size up.
  • Long-coated breeds often need a size up from what the tape suggests.
  • Deep-chested breeds such as greyhounds and whippets should be sized on chest girth first.
  • Sizing is not consistent across manufacturers, so a Medium in one item may not match a Medium in another. Always check the chart for the specific item.

Clothing and Costumes

Four-Legged Dinosaur Costume

Size Back length
XS 7.9 in
S 9.8 in
M 11.8 in
L 13.8 in
XL 15.7 in
XXL 17.7 in

Blue Monster Four-Leg Outfit

Size Back length
XS 7.9 in
S 9.8 in
M 11.8 in
L 13.8 in
XL 15.7 in
XXL 17.7 in

Hot Dog Costume

Size Back length Chest girth
S 7.9 in 15.7 in
M 9.8 in 16.5 in
L 11.8 in 21.3 in

Heart Pet Dress

Size Chest girth Pet weight
XS 11.8 in 2.2-6.6 lb
S 13.8 in 6.6-11 lb
M 15.7 in 11-15.4 lb
L 17.7 in 15.4-19.8 lb
XL 19.7 in 19.8-26.5 lb
XXL 21.7 in 26.5-39.7 lb

Christmas Elk Onesie

Size Chest girth Pet weight
XS 11.8 in 1.1-3.3 lb
S 13.8 in 3.3-5.5 lb
M 15.7 in 5.5-8.8 lb
L 17.7 in 8.8-13.2 lb
XL 19.7 in 13.2-17.6 lb
XXL 22.8 in 17.6-24.3 lb

Dog Riding Cowboy Costume

Size Chest girth Approx. pet weight
S 11.8-15.7 in about 7.7 lb
M 15.7-19.7 in about 11 lb
L 19.7-27.6 in about 16.5 lb

Knife-Holding Pet Costume

Size Max pet weight
XS up to 8.8 lb
S up to 16.5 lb
M up to 27.6 lb
L up to 49.6 lb
XL up to 66.1 lb

Harnesses and Collars

Breathable Reflective Harness Vest

Size Recommended pet weight
S 3.3-6.6 lb
M 6.6-11 lb
L 11-17.6 lb
XL 17.6-27.6 lb

Reflective Dog Harness Vest

Size Recommended pet weight
S 8.8-16.5 lb
M 16.5-30.9 lb
L 30.9-49.6 lb
XL 49.6-99.2 lb

Adjustable Dog Collar Pet Neckband

Size Neck fit (adjustable) Collar width
S 10.2-12.6 in 0.6 in
M 11.4-15.0 in 0.8 in
L 14.2-18.1 in 1.0 in
XL 15.7-19.7 in 1.2 in

Beds and Mats

Pick a bed a little longer than your dog measures from nose to base of tail while lying stretched out.

Pet-Friendly Dog Bed

Size Dimensions (L x W x H)
L 27.6 x 21.7 x 5.9 in
XL 34.6 x 23.6 x 6.3 in
2XL 43.3 x 31.5 x 6.3 in
3XL 51.2 x 41.7 x 7.9 in

Removable Waterproof Sofa Dog Bed

Dimensions (L x W x H)
28.3 x 23.2 x 6.7 in
36.2 x 27.2 x 6.7 in
42.1 x 31.5 x 6.7 in
48.0 x 35.0 x 8.3 in

Dog Donut Bed

Size Dimensions (L x W x H)
S 23.6 x 19.7 x 7.1 in
M 29.5 x 21.7 x 7.1 in
L 35.4 x 25.6 x 7.9 in
XL 41.3 x 29.5 x 9.8 in
XXL 47.2 x 33.5 x 9.8 in

Flat Bed Mat

Dimensions (L x W x H)
19.7 x 15.7 x 3.9 in
29.5 x 19.7 x 3.9 in
35.4 x 27.6 x 3.9 in
39.4 x 29.5 x 3.9 in
47.2 x 29.5 x 3.9 in

Plush Dog Bed Warm Sleeping Mattress

Size Diameter Pet weight
L 19.7 in under 11 lb
XL 23.6 in under 22 lb
XXL 27.6 in under 33.1 lb
XXXL 35.4 in under 66.1 lb

Dog Bed for Little Dogs

Size Dimensions (L x W) Pet weight
S 17.7 x 13.8 in under 11 lb
M 21.7 x 16.5 in under 22 lb
L 25.6 x 19.7 in under 33.1 lb

Cute Banana Boat Dog Bed

Size Dimensions (L x W x H) Pet weight
S 16.5 x 5.9 x 4.7 in kittens and very small pets
M 23.6 x 7.9 x 6.7 in under 5.5 lb
L 28.3 x 9.8 x 7.1 in under 11 lb
XL 36.6 x 11.8 x 8.7 in under 22 lb

Car-Mounted Dog Bed

Size Dimensions (L x W)
S 23.6 x 23.6 in
M 28.3 x 23.6 in
XL 43.3 x 23.6 in

Items without a chart here

A few items, including some sweatshirts, t-shirts, costumes, harnesses, collars and chew toys, show their size chart in the photos on the product page. Please check those images before ordering.

Still unsure?

Send us your measurements and we will tell you which size to order.