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.
Choose the size from the drop-down below to see your options:
MiaMilo Harness Size Chart
| Size | Neck circumference | Chest circumference | Chest strap length | Strap Width | Weight | Charms |
|---|---|---|---|---|---|---|
| XXS | 5.5 in — 8.7 in | 14.2 in — 16.5 in | 6.3 in | 1 in | 6.6 lb — 15.4 lb | 4 max |
| XS | 8.7 in — 14.2 in | 16.9 in — 20.5 in | 7.7 in | 1.2 in | 13.2 lb — 26.5 lb | 4 max |
| S | 10.2 in — 15.7 in | 20.5 in — 25.2 in | 9.1 in | 1.2 in | 19.8 lb — 41.9 lb | 4 max |
| M | 11.8 in — 18.9 in | 24.4 in — 29.1 in | 11.8 in | 1.2 in | 39.7 lb — 66.1 lb | 4 max |
| L | 15 in — 22.8 in | 27.6 in — 33.9 in | 13.8 in | 1.6 in | 57.3 lb — 83.8 lb | 4 max |
| XL | 18.9 in — 27.6 in | 30.7 in — 3 ft 1.8 in | 15.2 in | 1.6 in | 77.2 lb — 110.2 lb | 4 max |
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You need two measurements: the neck circumference, and the chest circumference taken just behind the front legs. Both have to fall inside a size's range. If only one of them fits, that size will not fit your dog. Our sizing guide shows you how to take both.
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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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Both measurements carry equal weight. A size works only if the neck and the chest both fall inside its range, so if one of them sits outside, that size is not the right one. The ranges of neighbouring sizes overlap, which means most dogs have a size that covers both. If no single size does0 ozet 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 and pick the size that puts both measurements in the lower part of its range. Because every size adjusts across that range, you keep room to let the harness out as your dog grows while it still fits properly right now. 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 water0 ozentle 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
| Size | Adjustment Options | Width | Charms |
|---|---|---|---|
| XS/S | 9.4 in — 11 in | 1.1 in | 4 max |
| S | 11.8 in — 13.4 in | 1.1 in | 4 max |
| S/M (slim) | 13.8 in — 15.7 in | 1.1 in | 6 max |
| S/M (mid) | 15 in — 17.5 in | 1.3 in | 6 max |
| S/M | 13.8 in — 15.9 in | 1.6 in | 6 max |
| M | 16.1 in — 17.7 in | 1.6 in | 6 max |
| M/L | 17.7 in — 19.7 in | 1.6 in | 6 max |
| L | 19.7 in — 21.7 in | 1.6 in | 6 max |
| L/XL | 21.7 in — 23.6 in | 1.6 in | 8 max |
| XL | 23.6 in — 25.6 in | 1.6 in | 8 max |
| XXL | 25.6 in — 27.2 in | 1.6 in | 10 max |
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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.
