How to choose the right dog collar size

A dog collar should stay secure without pressing into the neck. The reliable way to choose a size is to measure the dog you have, compare that measurement with the product's own size chart, and recheck the fit after the collar is adjusted.

What you need

• A soft dressmaker's tape measure
• Your dog standing comfortably
• The size chart for the exact collar
• A note of any recent growth, weight or coat change

If you do not have a soft tape, use a non-stretch piece of string, mark the overlap and measure it against a ruler. Do not use an existing collar as the only measurement unless you know it fits correctly.

How to measure a dog's neck

1. Place the tape around the part of the neck where the collar normally sits.
2. Keep the tape flat against the coat without pulling it tight.
3. Take the measurement more than once.
4. Compare it with the product's adjustable range, not just a label such as small or medium.
5. If the measurement sits at the extreme end of a range, check whether the next size gives a better adjustment position.

How should a collar fit?

As an initial check, you should normally be able to slide fingers comfortably between the collar and neck. The commonly used two-finger check is only a starting point because finger size, coat thickness, collar width and the dog's head shape vary.

The collar should not leave pressure marks, affect breathing or swallowing, or slide over the dog's head during normal use. Check the manufacturer's instructions and ask a qualified professional if you are unsure.

Check more than the neck measurement

• Adjustment range: enough room to fit securely without sitting on the final hole or limit.
• Width: proportionate to the dog and comfortable against the neck.
• Buckle and hardware: close fully and lie away from sensitive areas.
• Coat: thick or seasonal coats can change the apparent fit.
• Head shape: some dogs can back out of a standard collar more easily than others.

Puppies and growing dogs

Check a puppy's collar frequently. Growth can make a previously comfortable collar tight, while a collar left too loose can catch on objects or slip off. Replace it when the adjustable range no longer provides a secure fit.

Flat-faced dogs and breathing concerns

A collar can carry identification, but lead pressure on the neck may be unsuitable for some dogs, especially those with breathing or airway problems. Ask your vet about an appropriate walking setup. A correctly fitted harness may be recommended for lead attachment, while the collar remains for identification.

Do not use internet breed rules as a substitute for advice about an individual dog's breathing, neck or spine.

When a standard collar may not be appropriate

Dogs that can reverse out of collars, have unusual head-to-neck proportions, pull strongly, or have medical restrictions may need a different design or walking system. Get fitting help from a reputable trainer, veterinary professional or specialist retailer.

Recheck the fit

Inspect the collar regularly and after grooming, weight change or coat change. Look for stretched holes, cracks, damaged stitching, a loose buckle, sharp edges or distorted hardware. Replace damaged equipment rather than attempting a temporary repair.

Common sizing mistakes

• Ordering by breed or body weight alone.
• Assuming every brand uses the same small, medium and large measurements.
• Measuring over an unusually thick section of coat.
• Leaving room for growth by fitting the collar loosely.
• Forgetting to recheck a puppy or a dog whose weight changes.

Before the first walk

1. Adjust the collar indoors.
2. Check comfort and hardware.
3. Attach the lead and apply gentle pressure in different directions.
4. Confirm the collar cannot pass over the head.
5. Add identification as required and monitor the first use.

Browse dog collars and leads, view the Blush Pink Apple Leather Dog Collar, or compare the Ice Blue Apple Leather Dog Collar. Always use the measurements shown on the individual product page.