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Quick answer
An adult Pug usually measures 38–52 cm1 around the chest and weighs 6.3–8.1 kg2.
These are the sizes most adult Pugs need. Your dog may differ, so measure to be sure.
Get an exact size for your dogHow a Pug is built, and why it matters for fit
The UK breed standard gives an ideal weight of 6.3–8.1 kg2. PupClub Couture says female Pugs typically measure 38–48 cm around the chest and larger males 45–52 cm1.
Pugs are brachycephalic (flat-faced). The RSPCA advises walking flat-faced dogs on a harness rather than a collar, to avoid putting pressure on the neck and to help them breathe more easily, and warns that they can struggle in the heat3.
Bailey & Coco notes that Pugs have wide chests and short necks, so a harness needs a generous chest panel and straps that sit well below the throat4.
How to measure your Pug, 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.
Pug measuring tips
- Measure around the widest part of the chest, just behind the front legs. On a Pug this is well forward.
- Measure the base of the neck, and keep the tape well clear of the throat.
- Weigh your Pug too: Julius-K9 uses weight to choose between two sizes that both fit the chest6.
Want every detail, including neck, back length and weighing at home? Read our complete guide to measuring your dog.
Pug 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 Pug 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 Pug (chest 38 cm, 6.5 kg): size Baby 2
- A typical Pug (chest 45 cm, 7 kg): size Mini-Mini (also fits Baby 2)
- A larger Pug (chest 52 cm, 8 kg): size Mini (also fits Mini-Mini)
Overlaps in the Pug range: 40–45 cm: sizes Baby 2 and Mini-Mini both fit; 49–52 cm: sizes Mini-Mini and Mini 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 Pugs 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 Pug (chest 38 cm): size XXS
- A typical Pug (chest 45 cm): size XS
- A larger Pug (chest 52 cm): size XS
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 Pugs 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 Pug (chest 38 cm): size XS (also fits XXS, S)
- A typical Pug (chest 45 cm): size S (also fits XS, M)
- A larger Pug (chest 52 cm): size S (also fits M)
Overlaps in the Pug range: 38–41 cm: sizes XXS and XS both fit; 38–50 cm: sizes XS and S both fit; 40–52 cm: sizes S and M 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 Pugs need.
Check price on AmazonPuppies and growing dogs: when to re-measure
Small dogs reach adult weight sooner than large breeds9. A Pug's chest keeps broadening as it matures, so keep measuring through the first year.
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 kg9. An adult Pug at 6.3–8.1 kg falls in the under 6.5 kg and 6.5–9 kg groups.
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 Pug 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 Pug:
- Julius-K9: 40–45 cm: sizes Baby 2 and Mini-Mini both fit; 49–52 cm: sizes Mini-Mini and Mini both fit.
- Ruffwear: no overlapping sizes in this range.
- Bailey & Coco: 38–41 cm: sizes XXS and XS both fit; 38–50 cm: sizes XS and S both fit; 40–52 cm: sizes S and M 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 forward10, 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 Pug
Y-front harness that sits low on the chest
Keeps every strap away from the throat, which matters for a flat-faced dog.
Breathable, lightweight materials
Flat-faced dogs can struggle in the heat3.
Escape-resistant design
A Pug's waist is narrower than its chest, so a second strap further back makes backing out much harder.
Be careful with
- Any strap across the front of the throat.
- Thick, padded vests in warm weather.
- Head collars, which sit on the face.
Common mistakes
- Walking a Pug on a collar and lead instead of a harness. The RSPCA recommends a harness for flat-faced dogs3.
- Choosing by weight. Pugs are broad for their weight.
- A neck strap that creases the skin at the base of the neck. Bailey & Coco says a good fit shouldn't do that4.
- 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 Pug breathes noisily, tires quickly or struggles on walks, talk to your vet. A harness helps take pressure off the neck, but it doesn't treat breathing problems.
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 it11. Many owners clip the lead to the harness and use the collar for ID.
Pug harness questions
What size harness does a Pug need?
An adult Pug usually has a chest of 38–52 cm and weighs 6.3–8.1 kg2. That usually means Julius-K9 IDC Powerharness: sizes Baby 2 to Mini; Ruffwear Front Range Harness: sizes XXS or XS; Bailey & Coco Trail & Glow Harness: sizes XS or S. Measure your dog's chest to get the exact size.
How do I measure my Pug 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 Pug 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 Pug is between two harness sizes?
Should a Pug wear a harness or a collar?
Do male and female Pugs take different harness sizes?
Often. PupClub Couture puts females at 38–48 cm and larger males at 45–52 cm around the chest1. Measure your own dog.
Why does my Pug's harness twist or ride up to the throat?
Usually because it is too loose, or the neck opening is too big. Tighten to the two-finger fit and choose a design where the front sits low on the chest.