Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

How to Measure for a Cat Harness: 3 Vet-Approved Tips

Share

cat in harness with leash lying on the beach next to a pet carrier

Before buying or ordering online, you should measure your cat for a harness very carefully to ensure a proper fit. If the harness is too big, your cat might escape, and the harness can rub and irritate your cat’s skin. Sometimes, bald spots, injuries, or sores may even pop up. If the harness is too small, it can change your cat’s stride and lead to soreness or even difficulty breathing. Either way, your cat isn’t going to have a good time.

Sadly, measuring a finicky cat isn’t always the easiest. You need rather accurate measurements for this, though many harnesses are adjustable to some extent. Measuring your feline is often more challenging than it may seem.

It helps to have two sets of hands when measuring your cat for a harness. Once you have a friend to help you, you can try out the steps below for an accurate measurement.

divider 2 cats

 

Finding the Right Harness

With so many different variations and styles on the market, finding one right for your cat can be tough. The first thing you’ll want to confirm is if it is, in fact, a cat harness. Although dog harnesses are often marketed towards cats, there are simply different needs between the two species. Other factors might include materials, durability, reflectivity, and more. Learn about the top cat harnesses here.

Are you looking for the perfect cat harness? We suggest Hepper's Cat Harness & Leash Set, which includes a nicely designed, machine-washable harness made from soft, sturdy velvet and mesh.

Hepper Cat Harness and Leash Escape Proof Set
  • Escape Proof - Cat leashes and harnesses for walking aren't all equally secure. Our double aluminium...
  • Superior Comfort - Our cat harnesses are lightweight, made with premium velvet fabric, breathable...
  • Free Extra Strength Leash - You don't need to worry about your cat escaping this harness. This cat...

This harness is easy to put on and take off and features reinforced stitching, reflective stripes, and quick-release buckles. This set also includes a great leash made from durable nylon climbing rope.

At Catster, we’ve admired Hepper for many years and decided to take a controlling ownership interest so that we could benefit from the outstanding designs of this cool cat company!

divider 1 paws

The 3 Tips for the Purrfect Fit

How-to-measure-your-cat-for-a-harness
You are free to use this image but we do require you to link back to Catster.com for credit

1. Measure the Chest

First, measure around your cat’s chest. Most companies use this measurement. Aim for the area right behind your cat’s shoulder blades, but not on their shoulder blades. Sometimes, you may need to measure around their neck and/or their chest. In this case, you don’t want to measure where the collar goes. Instead, you want to measure their breastbone and up to their shoulder blades.

Be sure the measuring tape is tight, especially if your cat is on the fluffy side. You want the measuring tape to be snug—though don’t squeeze your cat too much. If your cat isn’t taking to the measuring tape, try distracting them with a high-quality treat. Give your feline something they don’t normally get to distract them.


2. Compare to the Manufacturer’s Chart

Once you’ve measured around your cat’s chest, it’s time to compare those measurements against the harness company’s guidelines. Each company is different, so don’t assume that your feline will always be one size. You should check each harness before you order to ensure that you’re purchasing the correct option.

Many harnesses are adjustable. Therefore, sizing is often a range. You don’t have to get the exact number, because you’ll be able to adjust it to fit as needed.

Before ordering, we do recommend reading reviews for the harness. Sometimes, harnesses run large or small. The reviews should let you know about this discrepancy, allowing you to choose a size bigger or smaller if you need to. Of course, if companies seem to be all over the place with their sizing, you may decide not to purchase their harness after all.

If you took both measurements, you might see both listed in certain sizes. If the ranges don’t match up, then you’ll have a hard decision to make. Sometimes, the reviews will give you the clues you need to choose a size. Other times, you may want to order two sizes to see which one fits best. Just make sure you can return the one that doesn’t fit.


3. Potential Complications

There are many times when measuring is less than straightforward. Very fluffy cats are harder to measure, as you have to compress their fur with the measuring tape. Otherwise, the cat’s harness will be far too large. Still, because of all that fur mass, these cats often need a larger size than shorthaired cats. Always measure to be sure, though.

Obese cats are also complicated to measure. Sometimes, the cat’s neck area doesn’t hold a lot of fat, while their chest does. Therefore, it can be challenging to determine which size to get.

Cats can also vary in size at different parts of their life. If your cat is overweight, you may be interested in a harness to help increase their daily activity and exercise. Of course, you’ll need a harness that can fit your cat now, but they may quickly become too small for that harness if they lose a bunch of weight. Sadly, there isn’t an easy way to counteract this. Sometimes, you just have to purchase multiple sizes.

Younger cats often gain weight as they age. Sometimes, you get lucky and have a cat that’s at the low end of a harness’s size range, allowing you to just adjust it larger as they grow. Sadly, this isn’t always possible. Sometimes, you end up needing to purchase two different sizes.

the owner puts on a leash with a harness on a kitten
Image Credit by: Katerina Dalemans, Shutterstock

divider 2 cats

Important Considerations

You will need to carefully measure your cat to figure out the right harness size. When you purchase a harness for your cat, it is very important to make sure it is not too tight. The ideal fit is secure but has enough space for you to put two fingers underneath. This helps to ensure that the harness is not so tight that it would hurt your cat but also not so loose that your cat can slip out.

Taking Measurements on a Fearful Cat

Some cats also hate being measured. Some may be fearful of the measuring tape and turn into a ball of fury whenever you try to wrap it around them. We recommend first attempting to introduce the cat to the measuring tape in a positive way using treats. However, completely familiarizing a scared cat with a measuring tape can take months, and you probably want to order the harness right away.

In this case, we recommend taking something your cat is already familiar with, like the string on a cat wand or a piece of ribbon, and using that as a measuring tool. Simply wrap the string around your cat’s body like you normally would, marking where the ends meet. Then, measure the string to that point to get an estimate of your cat’s size.

Luckily, sizing doesn’t have to be precise. Therefore, if your cat rolls around and makes it hard to measure them, just get as close as you can. If you have a hard time, be sure to purchase a harness that has some adjustability.

scared British blue-point cat hiding under the bed
Image Credit by: Zossia, Shutterstock

divider 3 paws

Conclusion

Measuring a cat is often easier said than done. The process is pretty simple—you need your cat’s chest measurement from right behind their armpits, as well as their lower neck measurement. Simply wrapping a tape measure around your cat will provide you with these measurements, allowing you to pick a perfectly sized harness.

However, many cats won’t just lay there while you measure them. Instead, you’ll need to wrestle and potentially distract your cat with treats. Luckily, most cats aren’t scared of tape measures, as they just look like ribbons. Fearful cats will be much harder to measure, though. Often, you’ll have to use a different material to wrap around your cat and then measure that material with a tape measure.

Having two pairs of hands is helpful in any case. You may need one person to distract your cat while the other does the measuring. Don’t attempt to hold the cat while measuring, though, as this can lead to your cat becoming scared.


Featured Image Credit: sofirinaja, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Ask Dr. Paola – Help! My Male Cat Gets Into Fights! (March 9, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

Why Your Cat’s Poop Smells Like a Biohazard

Nobody enjoys litter box duty, but sometimes it gets unbearable. The smell hits you from across the room. You’re scooping faster, lighting candles,...

RIP Your Furniture? Not With This Guide to Cat Scratch Damage Control

Your couch looks like it survived a minor apocalypse. The curtains have mysterious vertical shreds. That new rug you splurged on is already...

Celebrating 15 Years as the Most Popular Resident of No. 10 Downing Street

For almost 300 years, a rather unassuming Georgian building of black bricks with a shiny black door has been the official residence and...

More related

How to Tell if a Mother Cat Has Abandoned Her Kittens: Vet-Reviewed Facts & FAQ

Although it doesn’t happen too often, after giving birth, a mother cat may refuse to care for a particular kitten in her litter,...

Can I Get Worms From My Cat? Everything You Need to Know!

We love to have our cats close by for company and affection. But cat ownership has some downsides—like when they use their litter...

Do Cats Eat Christmas Trees? Vet-Reviewed Risks & Tips

Christmas is a magical time that fills our homes with warm smells and sparkly lights. Only, cat owners have to deal with the...

Can Cats Eat Canned Salmon? Vet-Reviewed Facts & FAQ

Cats are notorious for their love of fish, so feeding them a bit of canned salmon should be a no-brainer. What could be...

Keep reading

Can Cats Control Their Tails? Vet-Verified Positions & Movement Explained

Cats use their tails to communicate to the world through body language. You can tell a lot about a cat’s disposition by what their tail is doing. With that being said, cats have full control of their tails. The tail...

tail of a cat on vintage background

Cat Nail Biting: 3 Vet-Verified Tips If Your Cat Chews & Pulls Their Claws

For the most part, cats biting nails and chewing claws is a perfectly normal behavior, and if you notice your cat doing this, there is usually nothing to be overly concerned about. Cats are fastidious groomers, constantly licking and cleaning...

brown tabby cat with green eyes lying on the sofa, bites its nails

Is Patchouli Safe for Cats? Vet-Reviewed Health Facts

Humans have used essential oils for eons—as long ago as 4500 B.C. in Ancient Egypt, where they were used in ointments and cosmetics. Today, essential oils are used as part of aromatherapy and to help with minor health conditions. But...

Patchouli Flowers

Kitten Food vs Cat Food: What’s the Difference? Vet-Reviewed Facts

Kittens and cats may be the same species but have very different needs. With the world of pet ownership comes a load of questions, and pet food is often the main thing cat owners get stuck on when deciding what’s...

kitten VS Cat Food

Why Do Cats Run Away? 10 Common Reasons for This Behavior

When your cat runs away from home, it can be heartbreaking. You think you are giving your cat all they could need or want, why did they run away from you? Don’t be too alarmed, as this is not an...

cat sitting

Why Is My Cat Shaking While Purring? 4 Vet-Reviewed Reasons

Purring is the most common sound we hear from cats. No matter their size, all cats purr. Even kittens start purring when they’re only a few days old! And yet, we still don’t understand much about this infamous cat sound....

bengal kitten purring

Why Does My Cat Bite My Chin? 6 Vet-Verified Reasons for This Behavior

Cats have myriad ways in which they choose to express their emotions to humans. Some of the more common methods include meowing and purring, treading, and kneading. Your cat may also indulge in occasional chin biting. This is rarely a...

cat biting woman's chin

10 Best Cat Foods for Constipation in Canada in 2026: Reviews & Top Picks

The worst-case scenario for any cat owner is seeing your pet in distress when they’re trying to pass stool. Constipation can be painful and even eventually turn into a serious problem that will need vet intervention. It can be caused...

Siamese cat eating dry food from a bowl

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.