Sizing Guide
Every piece comes in a wide range of sizes. Pick a product, take one measurement, and we'll show you the size that fits.
How to measure your dog for a MiaMilo harness
Step 1. Neck (A)
Measure around the base of the neck, where the harness sits.
Step 2. Chest (B)
Measure around the widest chest area, just behind the front legs.
Step 3. Chest-strap length (C)
Measure from the front chest, between the front legs, to just behind them. If this is longer than your size's chest strap, choose the next size up.
Step 4. Check the fit
Leave room for two fingers under the straps and ensure free movement. Compare your measurements with the MiaMilo size guide.
Choose the size from the drop-down below to see your options:
MiaMilo Harness Size Chart
Cavalier, Shih Tzu, Havanese, Bichon Frise
- Chest circumference
- 14.2 in – 16.7 in
- Neck circumference
- 10.6 in – 17.3 in
- Chest strap length
- 6.3 in
- Harness weight
- 4.4 oz
- Strap Width
- 1 in
Dachshund, Pug, Westie, Mini Poodle, Mini Schnauzer, Boston Terrier, Jack Russell, Sheltie, Cockapoo, Cavapoo
- Chest circumference
- 16.7 in – 19.7 in
- Neck circumference
- 12.6 in – 22.4 in
- Chest strap length
- 7.7 in
- Harness weight
- 6.7 oz
- Strap Width
- 1.2 in
French Bulldog, Beagle, Corgi, Cocker Spaniel, Shiba Inu, Border Collie, Brittany, Staffy, Cattle Dog, Mini Doodles
- Chest circumference
- 20.7 in – 24.4 in
- Neck circumference
- 15.9 in – 28.7 in
- Chest strap length
- 9.1 in
- Harness weight
- 7.2 oz
- Strap Width
- 1.2 in
English Bulldog, Aussie Shepherd, Vizsla, Husky, AmStaff, Pit Bull, Springer Spaniel, Standard Poodle, Basset Hound
- Chest circumference
- 24.4 in – 27.6 in
- Neck circumference
- 18.5 in – 32.7 in
- Chest strap length
- 11.8 in
- Harness weight
- 8.4 oz
- Strap Width
- 1.2 in
Labrador, Golden Retriever, German Shepherd, Boxer, Doberman, Weimaraner, Malinois, Ridgeback, Goldendoodle, Labradoodle
- Chest circumference
- 27.6 in – 30.7 in
- Neck circumference
- 21.3 in – 38.2 in
- Chest strap length
- 13.8 in
- Harness weight
- 14.4 oz
- Strap Width
- 2 in
Rottweiler, Bernese Mountain Dog, Akita, Standard Bernedoodle
- Chest circumference
- 30.7 in – 34.6 in
- Neck circumference
- 23.6 in – 42.9 in
- Chest strap length
- 15.2 in
- Harness weight
- 15.1 oz
- Strap Width
- 2 in
| Size | Neck circumference | Chest circumference | Chest strap length | Harness weight | Strap Width | Charms |
|---|---|---|---|---|---|---|
| XXS Cavalier, Shih Tzu, Havanese, Bichon Frise | 10.6 in – 17.3 in | 14.2 in – 16.7 in | 6.3 in | 4.4 oz | 1 in | 4 max |
| XS Dachshund, Pug, Westie, Mini Poodle, Mini Schnauzer, Boston Terrier, Jack Russell, Sheltie, Cockapoo, Cavapoo | 12.6 in – 22.4 in | 16.7 in – 19.7 in | 7.7 in | 6.7 oz | 1.2 in | 4 max |
| S French Bulldog, Beagle, Corgi, Cocker Spaniel, Shiba Inu, Border Collie, Brittany, Staffy, Cattle Dog, Mini Doodles | 15.9 in – 28.7 in | 20.7 in – 24.4 in | 9.1 in | 7.2 oz | 1.2 in | 4 max |
| M English Bulldog, Aussie Shepherd, Vizsla, Husky, AmStaff, Pit Bull, Springer Spaniel, Standard Poodle, Basset Hound | 18.5 in – 32.7 in | 24.4 in – 27.6 in | 11.8 in | 8.4 oz | 1.2 in | 4 max |
| L Labrador, Golden Retriever, German Shepherd, Boxer, Doberman, Weimaraner, Malinois, Ridgeback, Goldendoodle, Labradoodle | 21.3 in – 38.2 in | 27.6 in – 30.7 in | 13.8 in | 14.4 oz | 2 in | 4 max |
| XL Rottweiler, Bernese Mountain Dog, Akita, Standard Bernedoodle | 23.6 in – 42.9 in | 30.7 in – 34.6 in | 15.2 in | 15.1 oz | 2 in | 4 max |
- Chest 19.7 in–20.7 in: choose S. Chest over 34.6 in: no MiaMilo size fits yet.
- Exactly on the line between two sizes: choose the larger size.
- Still growing and within 1 in of the top of the range: choose the next size up.
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You need three measurements: around the base of the neck where the harness sits, around the widest part of the chest just behind the front legs, and the chest-strap length from the front chest, between the front legs, to just behind them. The chest measurement decides the size. Our sizing guide shows you how to take all three.
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Yes. Each size adjusts across the neck and chest ranges shown in the sizing guide, so you pick the size your dog falls into and fine tune the fit once it arrives.
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Go by the chest. The neck ranges are wide and overlap across neighbouring sizes, so the chest measurement is the one that decides. Then check the chest-strap length: if it is longer than the chest strap of that size, choose the next size up. If you are still unsure, get in touch before you order and we will help you sort it out. Our Perfect Fit Promise covers you either way.
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Go up. At the very top of a range there is no adjustment left, and a harness that sits slightly roomy can be tightened, while one that is slightly tight cannot be let out.
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Measure your dog as they are today. If the chest is within 1.2 in (1 in) of the top of a size's range, choose the next size up so there is room to grow. With a fast growing puppy, re-measure every couple of months.
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Four, on every size from XXS to XL. The smallest harness takes just as many as the largest.
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Cold water, gentle cycle, in a mesh laundry bag, then hang dry. Skip the fabric softener: it coats the softshell and kills its breathability.
How to measure your dog's neck for a MiaMilo collar
Follow these instructions to accurately measure your dog’s neck.
Use a soft measuring tape or string.
Measure the inside of an old collar.
Measure in the middle where the collar sits — not too high around the jaw or too low around the shoulders.
Measure the circumference of your dog's neck with 2 fingers added for a comfortable fit.
Choose the size from the drop-down below to see your options:
MiaMilo Collar Size Chart
- Adjustment Options
- 9.4 in – 11 in
- Width
- 1.1 in
- Adjustment Options
- 11.8 in – 13.4 in
- Width
- 1.1 in
- Adjustment Options
- 13.8 in – 15.7 in
- Width
- 1.1 in
- Adjustment Options
- 15 in – 17.5 in
- Width
- 1.3 in
- Adjustment Options
- 13.8 in – 15.9 in
- Width
- 1.6 in
- Adjustment Options
- 16.1 in – 17.7 in
- Width
- 1.6 in
- Adjustment Options
- 17.7 in – 19.7 in
- Width
- 1.6 in
- Adjustment Options
- 19.7 in – 21.7 in
- Width
- 1.6 in
- Adjustment Options
- 21.7 in – 23.6 in
- Width
- 1.6 in
- Adjustment Options
- 23.6 in – 25.6 in
- Width
- 1.6 in
- Adjustment Options
- 25.6 in – 27.2 in
- Width
- 1.6 in
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The main difference lies in the collar width:
- S/M (slim): 1.1 in for a slim and refined width profile
- S/M (mid): 1.3 in offering a balanced, classic proportion
- Standard S/M: 1.6 in which provides a more substantial look
These options allow you to choose the most flattering width for your dog. Think of it like choosing a watch band width — it's about finding the right balance of style and proportion.
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For puppies, we recommend:
- Starting with our smaller sizes (XS/S or S) depending on breed
- Considering the slim (1.1 in) width profile initially, as it's more proportionate to their size
- Regular measurement checks every few months during their growth period
- Being prepared to size up as they grow - many puppies may go through 2-3 sizes in their first year.
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For dogs with thick coats:
- Make sure to get the measuring tape close to the skin
- Consider that the collar width might appear different when the coat is shorter/longer
- Choose a width that won't disappear in the fur - the 1.3 in or 1.6 in options often work better for thick-coated breeds.
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While breed can be a helpful guideline, we recommend basing your choice on actual neck measurements since sizes can vary greatly within breeds. The Size Helper on our website will show you exactly which sizes match your dog's measurements. That said, here are some general guidelines:
- Small breeds (e.g., Yorkshire Terriers): XS/S to S
- Medium breeds (e.g., Border Collies): S/M to M
- Large breeds (e.g., Labradors): M/L to L
- Giant breeds (e.g., Great Danes): L/XL to XXL
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For growing dogs:
- Take their current neck measurement
- Choose a size that puts their current measurement in the lower end of the adjustment range
- This provides room for growth while ensuring the collar fits properly now.
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A snug fit is essential for both safety and comfort. Our collars are designed for a snug fit that:
- Prevents the collar from slipping over your dog's head
- Ensures charms stay positioned properly on the collar
- Provides better control during walks
- Reduces the risk of the collar getting caught on objects
Remember: You should be able to fit two fingers comfortably between the collar and your dog's neck - any looser could be unsafe, any tighter could be uncomfortable.
