A black dog running across a green lawn wearing a silver cooling vest, with a black metal fence and trees in the background.

Size chart

For the best fit, compare your dog's neck size, back length, and chest girth measurements with the size chart.

Chillybuddy is designed for the dog who enjoys playing, walking or even running outside in basic city or suburban conditions. Easy to put on, easy to take off, the Chillybuddy Casual will always keep your dog cool on hot days. Sizes range from Petite to XX-large.

The only tool you will need is a soft tape measure. You can also measure your dog without a soft tape measure by using a piece of non-stretchy string and checking it against a rigid ruler after.
Cooling jacket size Neck circumference Back length Chest girth
Petite 11–15 in 13 in 16–20 in
X-Small 12–15 in 16 in 18–22 in
Small 15–18 in 19 in 18–22 in
Medium 17–20 in 21 in 22–29 in
Large 24 21–25 in 24 in 24–31 in
Large 27 21–25 in 27 in 24–31 in
X-Large 26–29 in 31 in 26–34 in

Last updated: August 2026

See all our sizes

... with a lovely model as a quick reference
Chillybuddy Cooling Jacket

Petite

$57.95
Chillybuddy Cooling Jacket

XS

$60.95
Chillybuddy Cooling Jacket

S

$63.95
Chillybuddy Cooling Jacket

M

$68.95
Chillybuddy Cooling Jacket

Large 24

$74.95
Chillybuddy Cooling Jacket

Large 27

$76.95
Chillybuddy Cooling Jacket

XL

$80.95
Chillybuddy Cooling Jacket

XXL

$85.95

Frequently asked questions

I want to buy this as a gift and cannot measure the dog. Help!

No worries. We made a breed guide to help anyone in a similar situation. Find the breed in the chart and use the listed size as your best estimate. Consider a larger option if you know the dog is bit bigger than average or ask the recipient for measurements if possible.

What is the difference between Large 24 and Large 27?

Both sizes use the same neck and chest-girth range. The difference is back length: Large 24 has a 24-inch back, while Large 27 has a 27-inch back. Choose based on your dog’s back measurement.
What if my dog’s neck, chest girth, and back measurements suggest different sizes?

Do not guess. Prioritize a comfortable chest fit, compare all three measurements, and contact Chillybuddy for fit help before ordering. Include your dog’s breed or mix, neck, back, and chest-girth measurements, plus a standing side-view photo if available.

Cooler days start with a comfortable fit

Hopefully the the breed guide gave you a quick way to get closer to the right size. Measure for the most confident Chillybuddy fit.

 Buy a Chillybuddy Jacket Learn How To Use It