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Dog Coat Size Calculator

Find the perfect coat size for your dog

Coat Size

S

Chest

21 in

Back

14 in

Widest part of ribcage

Base of neck

Collar to tail base

Recommended Coat Size

S

Good fit

Chest

21 in

Neck

14 in

Back

14 in

Size Chart Reference

XXSChest 10\u201314" | Back 6\u20139"
XSChest 14\u201318" | Back 9\u201312"
SChest 18\u201322" | Back 12\u201315"
MChest 22\u201326" | Back 15\u201318"
LChest 26\u201330" | Back 18\u201321"
XLChest 30\u201336" | Back 21\u201324"
2XLChest 36\u201342" | Back 24\u201328"
3XLChest 42\u201350" | Back 28\u201334"

Measuring Tips

Use a Soft Tape

A flexible fabric tape gives the most accurate measurements.

Between Sizes?

Always size up. A slightly loose coat is more comfortable than a tight one.

What You'll Need

MidWest iCrate 42" Folding Metal Dog Crate

MidWest iCrate 42" Folding Metal Dog Crate

$50-$804.7
View on Amazon
KONG Classic Dog Toy Durable Natural Rubber

KONG Classic Dog Toy Durable Natural Rubber

$8-$124.7
View on Amazon
BARKBAY No Pull Dog Harness Front Clip Reflective

BARKBAY No Pull Dog Harness Front Clip Reflective

$15-$254.5
View on Amazon
MidWest iCrate 42" Folding Metal Dog Crate

MidWest iCrate 42" Folding Metal Dog Crate

$50-$804.7
View on Amazon
KONG Classic Dog Toy Durable Natural Rubber

KONG Classic Dog Toy Durable Natural Rubber

$8-$124.7
View on Amazon
BARKBAY No Pull Dog Harness Front Clip Reflective

BARKBAY No Pull Dog Harness Front Clip Reflective

$15-$254.5
View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

Example Calculations

1French Bulldog (Medium Build)

Inputs

Chest Girth21 inches
Back Length14 inches
BreedFrench Bulldog

Result

Coat SizeS

Chest 21" falls in S range (18–22"), back 14" falls in S range (12–15"). Size S is recommended.

2Labrador Retriever

Inputs

Chest Girth32 inches
Back Length20 inches
BreedLabrador Retriever

Result

Coat SizeXL

Chest 32" falls in XL range (30–36"), back 20" falls in L range. XL is recommended based on chest.

Frequently Asked Questions

Q

How do I measure my dog for a coat?

Use a flexible fabric measuring tape. Measure three key areas: chest girth (widest part of ribcage), neck girth (base of neck), and back length (collar to tail base).

  • Chest girth: wrap tape around widest part of ribcage behind front legs
  • Neck: measure at the base where collar sits, typically 9–24 inches depending on breed
  • Back length: from collar base to where tail starts, typically 7–32 inches
  • Add 1–2 inches to chest measurement for comfort if between sizes
  • Measure while dog is standing naturally, not sitting or lying down
SizeChest (in)Back Length (in)
XXS10–146–9
S18–2212–15
M22–2615–18
XL30–3621–24
Q

What size coat does a French Bulldog need?

French Bulldogs typically wear a medium coat with 18–24 inch chest girth and 12–15 inch back length. Their barrel chest often requires sizing up from what their weight suggests.

  • Average French Bulldog chest: 18–24 inches (broad barrel chest)
  • Average back length: 12–15 inches (short-backed breed)
  • Neck: 13–16 inches (thick neck relative to body)
  • Always measure — Frenchies vary more than most breeds due to build
  • Look for coats with elastic or adjustable belly straps for barrel chests
Q

Should I size up or down if my dog is between sizes?

Always size up when between sizes. A slightly loose coat allows comfortable movement, while a tight coat restricts breathing and can cause chafing.

  • Too tight: restricts movement, can cause skin irritation and overheating
  • Too loose: coat shifts while walking, may trip dog or catch on objects
  • Size up for thick-coated breeds (Huskies, Golden Retrievers) to fit over fur
  • Size down only if coat has adjustable straps that cinch securely
  • Winter coats should allow room for a sweater layer underneath
Q

Which breeds need winter coats?

Short-haired, small, lean, and low-body-fat breeds benefit most from winter coats. Dogs with thick double coats generally do not need them.

  • Need coats: Chihuahua, Greyhound, Whippet, French Bulldog, Miniature Pinscher
  • Seniors and puppies of any breed may need extra warmth below 45°F
  • Double-coated breeds (Husky, Malamute, Samoyed) should NOT wear coats
  • Short-haired breeds lose body heat 40% faster than long-haired breeds
  • Coats are essential for small dogs under 10 lbs when temperature drops below 40°F

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Last Updated: Mar 19, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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