Dog Collar & Harness Size Calculator
Enter your dog's neck or chest measurement to get the right collar or harness size — with the two-finger safety check that keeps the fit safe and comfortable.
Find the size
How to measure safely
Collar — measure the neck
Wrap a soft tape around the base of the neck where the collar sits, snug against the fur.
Harness — measure the chest
Measure the girth around the widest part of the ribcage, just behind the front legs.
Apply the two-finger rule
Add about 2-3 cm so two flat fingers fit under the collar. Snug but never tight.
Re-check regularly
Puppies grow fast and coats change with seasons — re-measure monthly and after grooming.
Flexible tape to measure your dog's neck and chest accurately — the safe way to size.
View on Amazon →Strong adjustable collar for larger, stronger dogs.
View on Amazon →Even pressure for comfortable walks — size to the chest girth.
View on Amazon →Frequently asked questions
How do I measure my dog's neck for a collar?
Wrap a soft tape measure snugly around the base of the neck where the collar normally sits, leaving room for two flat fingers underneath. Match that measurement in cm to the chart above.
What's the difference between collar and harness sizing?
Collar size is based on neck circumference; harness size is based on chest circumference, which is larger for the same dog — always measure both separately rather than assuming the same letter size fits both.
What if my dog measures between two sizes?
Size up and use the adjustment holes to tighten. A collar that's slightly loose and adjustable is safer than one that's already tight, especially if your dog is still growing or has a thicker winter coat.