Buying dog clothing online should be exciting, not a guessing game.

Whether you’re shopping for cosy dog pyjamas, a warm winter jumper or a practical jacket, getting the right size is one of the most important parts of choosing dog clothes. A garment that is too tight may restrict movement, while one that is too loose can twist, slip or become uncomfortable.

The good news is that measuring your dog only takes a few minutes. This guide explains exactly what to measure, how to do it accurately and what to consider before choosing a size.

Why the Right Fit Matters

Well-fitting dog clothes should help your dog feel warm and comfortable without interfering with normal movement.

The right fit can:

• Keep the garment securely in place
• Allow your dog to walk, sit and lie down comfortably
• Reduce rubbing around the neck and legs
• Make toilet breaks easier
• Help prevent your dog from becoming frustrated with their clothing

This is particularly important for full-body garments such as pyjamas, where the fit needs to work around the chest, back and legs.

SPCA New Zealand advises that winter coats and jumpers should fit well and be removed when a dog shows signs of irritation or tries to take them off.

What You’ll Need

Before getting started, grab:

• A soft fabric measuring tape
• A pen and paper or your phone
• A few treats
• Someone to help, if your dog tends to wriggle

A rigid ruler or metal tape measure won’t sit naturally against your dog’s body, so a flexible tape will give you a more accurate result.

Have your dog stand naturally on a flat surface while you take the measurements. Avoid measuring while they are sitting, curled up or lying down.

The Three Main Dog Clothing Measurements

Most dog clothing size guides use three measurements:

1. Back length
2. Chest girth
3. Neck circumference

Depending on the style, your dog’s weight and leg length may also be useful.

1. Measure Your Dog’s Back Length

Measure from the base of the neck to the base of the tail.

The base of the neck is where the collar would naturally sit or where the neck meets the shoulders. Run the measuring tape along the spine and stop where the tail begins.

Do not measure from the top of the head or all the way to the end of the tail.

Helpful tip

Keep your dog standing straight with their head in a natural position. Looking sharply up or down can change the back measurement.

Back length is especially important when choosing:

• Dog pyjamas
• Winter coats
• Long-body jumpers
• Clothing for Dachshunds and other long-backed breeds

2. Measure Around the Chest

The chest is generally the most important measurement when choosing dog clothes.

Wrap the tape around the widest part of your dog’s chest, usually just behind the front legs. Make sure the tape is level all the way around and sits close to the body without pulling tightly.

You should generally be able to fit one or two fingers between the tape and your dog.

Why chest size matters

If the chest is too tight, the garment may restrict movement or rub behind the front legs. If it is too loose, the clothing may slide, twist or sit incorrectly.

When your dog falls between two sizes, it is often safest to choose the size that accommodates the chest measurement, unless the individual product guide advises otherwise.

3. Measure Around the Neck

Measure around the area where your dog’s collar would normally sit.

The tape should be comfortably snug, but not tight. Again, leave enough room to slide one or two fingers beneath it.

The neck measurement is particularly useful for:

• Dog jumpers
• Roll-neck sweaters
• Jackets
• Garments that pull over the head

Dogs with broad necks, narrow heads or deep chests may need extra attention when choosing pull-on clothing.

4. Check Your Dog’s Weight

Some brands include weight as an additional sizing guide.

Weight can be helpful, but it shouldn’t replace your dog’s actual body measurements. Two dogs of the same weight can have very different proportions.

For example, a compact French Bulldog and a long, lean Whippet may weigh a similar amount but require completely different clothing sizes.

Use weight as a supporting reference after checking the chest, neck and back measurements.

5. Consider Leg Length for Dog Pyjamas

For full-body pyjamas, check how the legs are designed to fit.

Some styles have longer sleeves, while others finish higher on the legs. Dogs with particularly short or long legs may need a different style even when the body measurements appear correct.

The cuffs should sit securely without covering the paws or restricting movement.

Once the pyjamas are on, watch your dog walk around. The legs shouldn’t slip inside the garment, bunch excessively or pull across the shoulders.

How Tight Should Dog Clothes Be?

Dog clothes should feel secure without being restrictive.

A good fit should allow your dog to:

• Walk normally
• Sit comfortably
• Lie down and stretch
• Move their shoulders freely
• Go to the toilet without the garment getting in the way

Check around the neck, armpits, chest and leg openings for pressure or rubbing.

Clothing is probably too tight if:

• It leaves deep marks in the coat or skin
• Your dog’s movement looks restricted
• The fabric pulls heavily across the chest
• Your dog appears uncomfortable
• It is difficult to slide one finger beneath the garment

It may be too loose if:

• It rotates around the body
• Legs slip inside the clothing
• The neckline falls down
• The garment drags or catches
• Your dog can easily wriggle out of it

What If Your Dog Is Between Sizes?

Dogs don’t always fit perfectly into one size category.

When your dog sits between two sizes, consider:

• The chest measurement first
• Whether the material stretches
• Whether your dog has a thick coat
• The intended use of the garment
• Your dog’s individual body shape

For stretchy pyjamas or jumpers, the smaller size may work when your dog is only slightly between sizes and the chest still fits comfortably.

For structured jackets or dogs with broad chests, choosing the larger size may provide better freedom of movement.

Always check the size guide provided on the individual product page, as sizing can vary between styles.

Measuring Different Dog Body Shapes

Breed labels alone aren’t reliable enough for choosing a size. Even dogs of the same breed can vary considerably.

Long-backed dogs

Dachshunds and similar breeds may need enough back coverage without excessive looseness around the chest or legs.

Deep-chested dogs

Whippets, Greyhounds and other sighthounds often have narrow waists and deep chests. Prioritise chest comfort and look for flexible clothing that follows their body shape.

Broad-chested dogs

French Bulldogs, Pugs and Staffordshire Bull Terriers may require more chest room than their back length would suggest.

Small dogs

Chihuahuas, Maltese and Toy Poodles can lose warmth quickly, but their small frames mean loose garments may slip or twist easily.

Fluffy dogs

Take measurements close to the body rather than loosely over the outer coat. If your dog has a particularly thick coat, allow enough room to prevent compression and discomfort.

Common Measuring Mistakes to Avoid

Measuring while your dog is sitting

Sitting can shorten the back and change the chest measurement. Have your dog stand naturally.

Pulling the tape too tightly

The tape should follow the body without squeezing it.

Adding too much extra room

Don’t add several centimetres “just in case” unless the product guide tells you to. The garment’s design should already include an appropriate amount of ease.

Choosing by breed alone

Breed can provide a starting point, but measurements are far more reliable.

Assuming every product fits the same way

Always check the individual size chart. A pair of pyjamas may fit differently from a cable-knit jumper or winter jacket.

Check the Fit When Your Order Arrives

Before removing tags, carefully try the garment on your dog.

Check that:

• The neck isn’t tight
• The chest sits comfortably
• The front legs move freely
• The garment reaches the intended point on the back
• The belly area allows easy toilet breaks
• Your dog can walk, sit and lie down normally

Let your dog wear it indoors for a few supervised minutes while you observe their movement and behaviour.

Remove the clothing if your dog becomes distressed, overheats, chews at it constantly or appears unable to move comfortably.

Find the Right Fit for Your Dog

Taking accurate measurements before ordering helps you choose dog clothing with greater confidence and reduces the likelihood of needing to exchange the size.

Remember to measure:

• Back length
• Chest girth
• Neck circumference
• Weight, when requested
• Leg proportions for full-body clothing

Once you have those measurements, compare them with the size guide on the individual product page rather than relying only on your dog’s usual size or breed.

Ready to find something cosy? Explore our range of dog clothes, including warm pyjamas, jumpers and seasonal styles for dogs across New Zealand and Australia.