How to Measure Your Dog for a Collar (Step-by-Step Guide)

A collar that's too tight chafes and restricts breathing. Too loose, and your dog can slip out of it entirely — which is exactly how dogs go missing at the park or bolt into traffic. Getting the measurement right takes two minutes and a soft tape measure. Here's how to do it properly.

What You'll Need

• A soft (fabric or sewing) tape measure — a rigid one will give you a less accurate reading
• Treats, for a dog that won't stand still
• A notepad to jot the number down before your dog wriggles off

Step 1: Measure the Base of the Neck

Wrap the tape measure around the base of your dog's neck, where a collar would naturally sit — just above the shoulders. Keep the tape snug but not tight.

Step 2: Add Room for Comfort

Once you have the base measurement, add 2 fingers' width (roughly 2-5cm depending on your dog's size) to allow the collar to sit comfortably without choking. You should always be able to slide two fingers flat between the collar and your dog's neck.

Step 3: Check the Fit With the Two-Finger Rule

Once the collar is on, do a final check: two fingers should slide in comfortably, but you shouldn't be able to pull the collar over your dog's head or ears without unbuckling it. If it slips off, it's too loose.

Step 4: Recheck as Your Dog Grows

Puppies and young dogs need their collar fit checked every few weeks. A collar that fit perfectly two months ago can be dangerously tight — or loose enough to slip off — by the time your dog finishes growing.

While You're Measuring, Check for Fleas Too

Collar-fitting time is also a good moment to think about flea prevention, since you're already handling your dog's neck and coat. Our Anti-Flea Collar for Dogs & Cats is waterproof, adjustable to fit the same way as a standard collar, and provides weeks of continuous flea protection without sprays or monthly treatments — a low-maintenance option for pets who spend time outdoors.

A Note on Collars vs. Harnesses

Collars are great for holding ID tags and everyday identification, but if your dog pulls hard on the leash, consider pairing a well-fitted collar with a harness for walks to protect their neck and trachea from strain.

Final Thoughts

Measuring for a collar isn't complicated, but it's easy to skip — and an ill-fitting collar is one of the most preventable causes of pets going missing or getting hurt. Take the two minutes, check the fit regularly, and your dog will be more comfortable for it.

👉 Browse collars and flea protection for dogs and cats at The Pet Suppliers.