A good collar or harness fit should be secure without pinching, rubbing or restricting normal movement. Dog sizes vary a lot, even within the same breed, so measure your dog rather than choosing by breed name alone.
Shop dog collars or shop dog harnesses.
How to measure for a dog collar
Measure around your dog's neck where the collar normally sits. Keep the tape snug but not tight. Compare that measurement with the size range shown on the individual product page.
How to measure for a dog harness
Most harnesses use chest or girth measurement, taken around the widest part of the ribcage just behind the front legs. Some also use neck measurements, so check the product's own size chart.
How should a collar fit?
A collar should sit securely without restricting breathing or causing rubbing. Check the fit regularly, especially on puppies and dogs whose weight changes.
How should a harness fit?
A harness should be secure enough that your dog cannot back out of it, but it should not cut into the neck, armpits or shoulders. Your dog should still be able to walk and move normally.
Size guide FAQs
Can I choose a size by breed?
Breed can be a rough guide, but individual dogs vary. Neck and chest measurements are more reliable.
What if my dog is between sizes?
Use the individual product chart and prioritise the measurement the product is designed around, usually neck size for collars and chest girth for harnesses.
Should I measure over fur?
Measure your dog as they normally are when wearing the collar or harness. Very thick coats can affect fit, so recheck after grooming if needed.
