Getting a collar size right starts with a good measurement. It takes a few minutes and you don't need any special tools.
What you need
- A soft tape measure, or a piece of string and a ruler
- Your dog, ideally calm and standing still
- A few treats to help
Step by step
- Stand your dog up. Have your dog standing normally, with the head in a natural position.
- Find the spot. Measure where the collar would normally sit, at the base of the neck. It shouldn't be right against the throat.
- Wrap the tape around the neck. Keep it flat and level, not twisted.
- Add the fit allowance. The tape should be snug, but you should be able to slide two fingers under it. Read the number where the tape meets.
- Write it down. Note the number in centimetres or inches.
If you use string
Wrap the string around the neck, mark where it meets, lay it flat against a ruler and measure the length.
Compare with the size chart
Every collar has an adjustable range. Pick a size where your measurement sits within the range, ideally near the middle. Our size guide shows the ranges for our collars.
Common mistakes
- Measuring over a thick collar or harness
- Pulling the tape too tight
- Measuring too close to the head or shoulders
- Not allowing for a growing puppy
Double-check
Measure twice, particularly if you're ordering a personalised collar, where the engraving is made for your dog. Then read how tight a collar should be to confirm.
Tips for a more accurate measurement
- Measure when your dog is relaxed. A treat helps them stand still.
- Keep the tape flat. A twisted tape gives a wrong reading.
- Measure at the right spot. Where the collar naturally sits is what counts.
- Take two readings. If they differ, use the larger and compare with the size chart.
- Note the coat. For a fluffy dog, feel where the neck is under the fur.
Measuring a wriggly puppy
Puppies rarely stand still. Try measuring after a walk, when they're calmer, or ask a second person to hold and reward them. A piece of string can be easier than a tape, since you can wrap it quickly and measure it afterwards.
What to do with your number
Compare it with the size chart for the collar you like. You want your measurement to sit within the adjustable range, ideally near the middle. If it's at the very top or bottom of a size, look at the next size up or down.
Frequently asked questions
How much should I add to the measurement?
The size chart usually accounts for comfort, so compare your actual neck measurement with the range. Then use the two-finger check when you fit the collar.
Should I measure in centimetres or inches?
Either is fine, but make sure you match the units on the size chart.
Does the measurement change over time?
Yes, particularly for puppies, and if your dog gains or loses weight. Re-measure occasionally.
What if my dog has a very thick neck or lots of fur?
Measure at the neck, feeling beneath the fur, and pick a size where your number sits in the middle of the range.
Where is the size chart?
On each product page, and in our size guide.
Shop
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