size & measuring guide

It’s important for your dog’s health and their safety that items like collars and harness fit correctly. By measuring them properly you can make sure you buy the right item in the right size.


A dog’s collar needs to fit such that it can’t easily be slipped out of, but also it should not restrict or affect breathing or swallowing. Age and breed can also be a factor, so consider how likely it is that your dog’s neck will change size and buy a collar that adjusts accordingly. This is particularly important with puppies who will typically increase a whole collar size as they reach adolescence.


Use a tape measure (ideally) or a piece of string or similar with a ruler.

With your dog sitting or standing, place the measure around their neck at a point around 5-8cm from their head. Pull the measure or string snug to the dog’s neck, but not tight.
Once you have a measurement. Repeat the process, just to be sure.

This is your dog’s neck measurement.

illustration of dog neck measurement

You should be able to comfortably fit two fingers under the collar so it’s not so tight as to discomfort the dog but not so loose that the dog might slip out of the collar, so look for a collar with a mid-range measurement of the size you’ve taken, for example, for a neck measurement of 32cm, look for a collar around 27-40cm. Our collar sizes list a minimum and maximum adjustment size.

Remember, collar size can change over time (especially if your dog is fond of treats) so always measure your dog before buying a new collar.

Lastly, if your dog is a sighthound – lurchers, greyhounds etc. – it’s usually best that they wear a special collar that is wider on one side. This protects them should they pull excessively when they see something they instinctively want to chase.

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