Free size calculator
Dog Harness Size Calculator
Enter your dog’s chest and neck, or pick a breed, and see the harness size your dog needs and every harness in our shop that fits.
How to measure your dog for a harness
You need two numbers. The chest is the most important: wrap a soft tape measure around the widest part of the rib cage, just behind the front legs. The neck is measured where a collar sits, around the base of the neck. Keep the tape snug but not tight, with the dog standing straight. If you have no tape, use a string and lay it on a ruler.
How a harness should fit
A well-fitted harness lets you slide two fingers flat under every strap. It should not ride up into the armpits, rub behind the front legs or slip over the head when your dog pulls back. If your dog is between two sizes, choose the larger one and tighten the adjusters; a harness that is too small chafes, while one that is too big lets a dog back out of it.
Harness size by weight or by measurements?
Weight charts are a rough guide only. Two dogs of the same weight can have very different chests: a 10 kg French Bulldog has a much wider chest than a 10 kg Beagle. That is why every harness in our shop has its own size chart in centimeters and inches, and our calculator compares your dog’s chest and neck with each of them.
Typical chest and neck by breed
Typical adult measurements from breed studies and breed-named size charts. Dogs of one breed vary, so measure your own dog before you order; the numbers are a starting point, not a guarantee.
| Breed | Chest | Neck | Weight |
|---|---|---|---|
| French Bulldog | 55 cm (21.7 in) | 37.5 cm (14.8 in) | 28 lb (12.5 kg) |
| Chihuahua | 30.5 cm (12 in) | 22.5 cm (8.9 in) | 7 lb (3 kg) |
| Pug | 50 cm (19.7 in) | 33.5 cm (13.2 in) | 20 lb (9 kg) |
| Yorkshire Terrier | 34 cm (13.4 in) | 20 cm (7.9 in) | 9 lb (4 kg) |
| Pomeranian | 37.5 cm (14.8 in) | 29 cm (11.4 in) | 9 lb (4 kg) |
| Shih Tzu | 42 cm (16.5 in) | 31 cm (12.2 in) | 19 lb (8.5 kg) |
| Maltese | 38 cm (15 in) | 29 cm (11.4 in) | 9 lb (4 kg) |
| Dachshund (miniature) | 40 cm (15.7 in) | 22 cm (8.7 in) | 13 lb (6 kg) |
| Boston Terrier | 48 cm (18.9 in) | 34.5 cm (13.6 in) | 19 lb (8.5 kg) |
| Cavalier King Charles Spaniel | 37.5 cm (14.8 in) | 30.5 cm (12 in) | 24 lb (11 kg) |
| Miniature Schnauzer | 40 cm (15.7 in) | 30.5 cm (12 in) | 20 lb (9 kg) |
| English Bulldog | 72.5 cm (28.5 in) | 50 cm (19.7 in) | 55 lb (25 kg) |
| American Pit Bull Terrier | 68 cm (26.8 in) | 44 cm (17.3 in) | 51 lb (23 kg) |
| Labrador Retriever | 82.5 cm (32.5 in) | 46 cm (18.1 in) | 73 lb (33 kg) |
| Golden Retriever | 82.5 cm (32.5 in) | 46.5 cm (18.3 in) | 72 lb (32.5 kg) |
| German Shepherd | 90 cm (35.4 in) | 50 cm (19.7 in) | 77 lb (35 kg) |
| Australian Shepherd | 67 cm (26.4 in) | 43.5 cm (17.1 in) | 53 lb (24 kg) |
| Beagle | 55 cm (21.7 in) | 35.5 cm (14 in) | 35 lb (16 kg) |
| Bernese Mountain Dog | 90.5 cm (35.6 in) | 53 cm (20.9 in) | 93 lb (42 kg) |
| Bichon Frise | 34 cm (13.4 in) | 29.5 cm (11.6 in) | 15 lb (7 kg) |
| Border Collie | 71.5 cm (28.1 in) | 38.5 cm (15.2 in) | 44 lb (20 kg) |
| Boxer | 82.5 cm (32.5 in) | 43 cm (16.9 in) | 68 lb (31 kg) |
| Bull Terrier | 70 cm (27.6 in) | 47 cm (18.5 in) | 60 lb (27 kg) |
| Dachshund (standard) | 43 cm (16.9 in) | 32 cm (12.6 in) | 24 lb (11 kg) |
| Doberman Pinscher | 82.5 cm (32.5 in) | 45 cm (17.7 in) | 79 lb (36 kg) |
| Great Dane | 99.5 cm (39.2 in) | 55.5 cm (21.9 in) | 139 lb (63 kg) |
| Havanese | 35 cm (13.8 in) | 25.5 cm (10 in) | 10 lb (4.5 kg) |
| Italian Greyhound | 42 cm (16.5 in) | 25.5 cm (10 in) | 11 lb (5 kg) |
| Jack Russell Terrier | 47.5 cm (18.7 in) | 29 cm (11.4 in) | 15 lb (7 kg) |
| Lhasa Apso | 37.5 cm (14.8 in) | 35 cm (13.8 in) | 15 lb (7 kg) |
| Papillon | 32.5 cm (12.8 in) | 20 cm (7.9 in) | 7 lb (3 kg) |
| Pekingese | 42.5 cm (16.7 in) | 34 cm (13.4 in) | 11 lb (5 kg) |
| Pembroke Welsh Corgi | 58 cm (22.8 in) | 37 cm (14.6 in) | 24 lb (11 kg) |
| Poodle (miniature) | 38 cm (15 in) | 27.5 cm (10.8 in) | 13 lb (6 kg) |
| Poodle (standard) | 68.5 cm (27 in) | 37.5 cm (14.8 in) | 55 lb (25 kg) |
| Poodle (toy) | 34.5 cm (13.6 in) | 25.5 cm (10 in) | 9 lb (4 kg) |
| Rottweiler | 92.5 cm (36.4 in) | 56 cm (22 in) | 106 lb (48 kg) |
| Siberian Husky | 78 cm (30.7 in) | 46 cm (18.1 in) | 49 lb (22 kg) |
| West Highland White Terrier | 45.5 cm (17.9 in) | 30.5 cm (12 in) | 22 lb (10 kg) |
| Whippet | 65 cm (25.6 in) | 34 cm (13.4 in) | 33 lb (15 kg) |
Which harness to choose
Step-in and vest harnesses suit small dogs that dislike things going over their head; Y-front and padded harnesses spread the pull for strong dogs. See all designer dog harnesses, our large dog harnesses for big breeds, matching harness and leash sets and designer dog collars. Our dog size guide saves your dog’s measurements so every product shows the size that fits.
Dog harness size FAQ
What size harness does my dog need?
Measure the chest behind the front legs and the neck, then pick the size whose chest range includes your dog’s chest. The calculator above does this for every harness in our shop.
Should a harness be tight or loose?
Snug: two fingers should fit flat under each strap, but the harness should not slide when you pull it gently.
Is a harness better than a collar?
For dogs that pull, small breeds and flat-faced breeds such as French Bulldogs and Pugs, a harness takes the pressure off the neck and throat.
My dog is between two sizes. Which one?
Choose the larger size and adjust the straps; you can always tighten a harness, but not make a small one bigger.
