Quick answer
Use a soft measuring tape around the base of your dog's neck where the collar naturally sits, then add two finger widths of space for a snug but safe fit.
Why accurate collar sizing matters
A collar that is too tight can cause discomfort, chafing, or even restrict breathing, while one that is too loose may slip off during walks. Getting the right fit keeps your dog safe and comfortable whether you are using a basic collar or a matching lead set.
When to re-measure your dog
Puppies grow quickly, so check the fit every few weeks. Even adult dogs can gain or lose weight, so re-measure after any significant change in body condition or season.
How to measure your dog for a collar in 4 steps
- 1. Gather your tools: Use a soft fabric measuring tape. If you do not have one, use a piece of string and then measure it against a ruler. Do not use a metal tape measure—it is uncomfortable and less accurate for a curved neck.
- 2. Find the right spot: Place the tape around the base of your dog's neck, where a collar would naturally sit—just behind the ears and above the shoulders. Avoid measuring at the widest part of the head; that will give you a too-loose fit.
- 3. Take the measurement: Snug the tape so it touches the fur but does not press into the skin. Read the measurement where the tape overlaps. If your dog wiggles, distract them with a treat and try again. A relaxed dog gives a more accurate reading.
- 4. Apply the two-finger rule: Add the width of two fingers (about 1 inch or 2.5 cm) to the measurement. This extra space allows for comfort and prevents choking. For puppies, leave a little more room since they grow fast, but check the fit weekly.
Products that make measuring easier
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Collar - Forest Green: Available in 4 sizes: Extra Small, Small, Medium, Large. Knowing your dog's neck measurement lets you pick the right size from the range without guessing.
Collar - Forest Green
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Puppy Collar & Lead Set - Pink: Fully adjustable collar with a D ring for lead and ID tag attachment. An adjustable collar gives you wiggle room after measuring, so you can fine-tune the fit as your puppy grows.
Puppy Collar & Lead Set - Pink
