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Quick answer
An adult German Shepherd Dog usually measures about 75–95 cm (our estimate)1,2 around the chest and weighs 30–40 kg3.
These are the sizes most adult German Shepherd Dogs need. Your dog may differ, so measure to be sure.
Get an exact size for your dogHow a German Shepherd Dog is built, and why it matters for fit
The UK breed standard gives an ideal height of 63 cm for dogs and 58 cm for bitches, with 2.5 cm either way tolerated4. A UK breed rescue puts a healthy male at around 35–40 kg and a bitch at 30–35 kg, and describes the breed as slightly long compared with its height, lean and well muscled3.
That 5 cm difference in height between dogs and bitches carries through to the chest, so a male and a female can need different harness sizes. PupClub Couture notes that German Shepherds regularly measure over 75 cm around the chest2. There's no published breed range, so our figure of 75–95 cm is an estimate1.
GSDs pull with real power, so a harness with strong stitching and hardware matters as much as the size.
How to measure your German Shepherd Dog, step by step
- Get a soft tape measure, or a piece of string and a ruler. Stand your dog on a level floor with all four feet square underneath it.
- Find the measuring point: the widest part of the ribcage, just behind the front legs5. Julius-K9 asks you to measure a set distance behind the front legs, which depends on the size: two finger-widths for the Baby sizes, three for Mini-Mini and Mini, and four for size 0 and up6.
- Wrap the tape all the way round. Keep it flat and untwisted, snug against the body but not squeezing. Read the number in centimetres where the end meets the tape.
- Measure twice5. If the two readings differ, use the larger one.
- Weigh your dog too. Julius-K9 gives a weight range for every size as a second guide6; the other brands here size by chest only.
German Shepherd Dog measuring tips
- GSDs have a thick double coat. Press the tape through the coat so it sits against the body.
- For Julius-K9, measure four finger-widths behind the front legs, as for all sizes from 0 up6.
- If you have a male and a bitch, measure both. They may well need different sizes.
Want every detail, including neck, back length and weighing at home? Read our complete guide to measuring your dog.
German Shepherd Dog harness size by brand
Each brand cuts its sizes differently, so the same dog can be a different size, or a different letter, in each. Here is how a typical adult German Shepherd Dog fits each chart, and why.
Julius-K9
IDC Powerharness
Julius-K9 lists a chest range and a weight range for every size6. Chest girth is the main guide; we use weight to choose between two sizes when the chest fits both.
- A smaller German Shepherd Dog (chest 75 cm, 30 kg): size 1 (also fits 0, 2)
- A typical German Shepherd Dog (chest 85 cm, 35 kg): size 2 (also fits 1, 3)
- A larger German Shepherd Dog (chest 95 cm, 40 kg): size 3 (also fits 2)
Overlaps in the German Shepherd Dog range: 75–76 cm: sizes 0 and 1 both fit; 75–85 cm: sizes 1 and 2 both fit; 82–95 cm: sizes 2 and 3 both fit.
Sizes overlap by design; chest girth is the main guide, weight is secondary.
| Size | Chest | Weight |
|---|---|---|
| Baby 1 | 29–36 cm | 0.8–3 kg |
| Baby 2 | 33–45 cm | 2–5 kg |
| Mini-Mini | 40–53 cm | 4–7 kg |
| Mini | 49–67 cm | 7–15 kg |
| 0 | 58–76 cm | 14–25 kg |
| 1 | 63–85 cm | 23–30 kg |
| 2 | 71–96 cm | 28–40 kg |
| 3 | 82–115 cm | 40–70 kg |
| 4 | 96–138 cm | 70–90 kg |
Highlighted rows are the sizes typical adult German Shepherd Dogs need.
Check price on AmazonRuffwear
Front Range Harness
Ruffwear sizes the Front Range Harness by chest girth only7, so your tape measure is all you need.
- A smaller German Shepherd Dog (chest 75 cm): size M
- A typical German Shepherd Dog (chest 85 cm): size L/XL
- A larger German Shepherd Dog (chest 95 cm): size L/XL
Sized by chest girth only.
| Size | Chest |
|---|---|
| XXS | 33–43 cm |
| XS | 43–56 cm |
| S | 56–69 cm |
| M | 69–81 cm |
| L/XL | 81–107 cm |
Highlighted rows are the sizes typical adult German Shepherd Dogs need.
Check price on AmazonBailey & Coco
Trail & Glow Harness
Bailey & Coco sizes the Trail & Glow Harness by chest girth only8, so your tape measure is all you need.
- A smaller German Shepherd Dog (chest 75 cm): size L (also fits XL)
- A typical German Shepherd Dog (chest 85 cm): size XL
- A larger German Shepherd Dog (chest 95 cm): size XL
Overlaps in the German Shepherd Dog range: 75–83 cm: sizes L and XL both fit.
Very adjustable, so neighbouring sizes overlap a lot. Sized by chest girth only.
| Size | Chest |
|---|---|
| XXS | 22–41 cm |
| XS | 26–50 cm |
| S | 35–66 cm |
| M | 40–71 cm |
| L | 55–83 cm |
| XL | 71–99 cm |
Highlighted rows are the sizes typical adult German Shepherd Dogs need.
Check price on AmazonPuppies and growing dogs: when to re-measure
Canine Culture says German Shepherds are fully grown at around 18–24 months9, which fits research showing large dogs keep growing well into their second year10. Expect a GSD puppy to go through several harness sizes.
The largest study of puppy growth so far, based on records from over 6 million young dogs, grouped dogs by adult weight: under 6.5 kg, 6.5–9, 9–15, 15–30 and 30–40 kg10. An adult German Shepherd Dog at 30–40 kg falls in the 30–40 kg group.
Size a puppy on its chest measurement today, not on the size you expect it to reach5. A harness bought to "grow into" is loose now, and a loose harness slips, rubs and is easier to back out of.
While your puppy is growing fast, we suggest measuring its chest every two weeks, then monthly until it stops changing. A quick check in between: if you can no longer slide two fingers under the straps, measure again.
Most harnesses adjust over a good part of their range, so a growing puppy may stay in one size for a while. When your puppy's chest reaches the top of its size's range, move up.
If your German Shepherd Dog is between two sizes
Brand charts often overlap, so a chest measurement can fall inside two sizes. Here is where that happens for a typical adult German Shepherd Dog:
- Julius-K9: 75–76 cm: sizes 0 and 1 both fit; 75–85 cm: sizes 1 and 2 both fit; 82–95 cm: sizes 2 and 3 both fit.
- Ruffwear: no overlapping sizes in this range.
- Bailey & Coco: 75–83 cm: sizes L and XL both fit.
How to choose:
- Our size finder picks the size where your dog's measurement sits nearer the middle of the range, so the harness can be adjusted either way.
- Ruffwear says that if your dog is right on the border between two sizes and fully grown, choose the larger size7. For a growing puppy that is truly between sizes, Ruffwear also suggests the larger one5.
- For Julius-K9, check the weight ranges too: if your dog's weight only fits one of the two sizes, go with that one6.
- Deep-chested dogs with a narrow waist can slip a loose harness, so if the larger size would only just fit on its tightest setting, the smaller one is usually safer.
Fit checks when the harness arrives
Two-finger rule
You should be able to slide two fingers flat under every strap, and no more7. Tighter than that can rub; looser can slip.
Strap behind the front legs
The strap around the body should sit a little way behind the front legs, not pressed up into the "armpit", where it will rub as your dog walks.
Nothing on the throat
Every strap at the front should sit on the breastbone or low on the chest, not across the throat.
Free shoulders
Watch your dog walk and trot. Its stride should look the same as without the harness. A small study found harnesses can shorten how far the shoulder reaches forward11, so if the stride looks shorter, adjust the fit or try another style.
Check for rubbing
After the first few walks, look behind the front legs, under the chest and around the neck for redness or broken hairs. If you find any, loosen or reposition the harness. If the skin is sore, stop using it and ask your vet.
Escape test
With the harness on, gently pull the lead forwards, then backwards and upwards. The harness shouldn't slide over the shoulders or ribs. If it does, tighten it, or choose a design with an extra strap behind the ribcage.
Re-check after a week
Webbing and buckles can settle in the first few walks. Check the two-finger fit again after a week.
Harness styles that suit a German Shepherd Dog
Sturdy Y-front harness with a padded chest plate
Spreads a strong dog's pull over a wide area and keeps pressure off the throat.
Grab handle on the back
Useful for holding a big dog steady at kerbs, gates and the vet's door.
Chest (front) lead ring
Gives more control over a strong puller when used with training.
Be careful with
- Lightweight harnesses made for medium dogs. Check the buckles, D-rings and stitching are built for a large, strong breed.
- Buying an adult size for a puppy "to grow into". It will be loose, slip and rub.
Common mistakes
- Sizing a bitch from a male GSD's measurements, or the other way round.
- Measuring over the thick coat instead of through it.
- Measuring the neck instead of the chest. Harness sizes are set by chest girth.
- Assuming a size letter means the same thing in every brand. A Medium in one brand can be a Large in another, so check each chart in centimetres.
- Buying a size up "to grow into" for a puppy.
A note on health
If your German Shepherd moves stiffly or seems uncomfortable in a harness, take it off and talk to your vet.
Collar and ID tag: the UK rule
In the UK, a harness doesn't replace a collar. A dog in a public place must wear a collar with the owner's name and address on it, or on a tag or plate attached to it12. Many owners clip the lead to the harness and use the collar for ID.
German Shepherd Dog harness questions
What size harness does a German Shepherd Dog need?
An adult German Shepherd Dog usually has a chest of about 75–95 cm (our estimate) and weighs 30–40 kg3. That usually means Julius-K9 IDC Powerharness: sizes 1 to 3; Ruffwear Front Range Harness: sizes M or L/XL; Bailey & Coco Trail & Glow Harness: sizes L or XL. Measure your dog's chest to get the exact size.
How do I measure my German Shepherd Dog for a harness?
Stand your dog square, then wrap a soft tape around the widest part of the chest just behind the front legs5. Keep it flat and snug and read it in centimetres. Measure twice. See our full guide to measuring your dog.
What size harness for a German Shepherd Dog puppy?
Size a puppy on its chest measurement today, not its expected adult size5. Measure every couple of weeks while it grows fast and move up a size when its chest reaches the top of the current size.
What if my German Shepherd Dog is between two harness sizes?
Do male and female German Shepherds need different harness sizes?
When will my German Shepherd puppy reach its adult harness size?
Canine Culture says German Shepherds are fully grown at around 18–24 months9. Measure every couple of weeks while your puppy is growing fast.
Does a German Shepherd need a harness or a collar?
Many owners use both. A harness keeps pressure off the neck on walks, but in the UK a dog in a public place must wear a collar with the owner's name and address on it or on a tag12.