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Why Do Cats Fall Over in a Harness? Our Vet Explains

Written by: Dr. Karyn Kanowski BVSc MRCVS (Veterinarian)

Last Updated on February 26, 2025 by Catster Editorial Team

VET APPROVED

Dr. Karyn Kanowski Photo

WRITTEN BY

Dr. Karyn Kanowski

Veterinarian, BVSc MRCVS

The information is current and up-to-date in accordance with the latest veterinarian research.

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Trigger Warning: The study described below includes harm done to cats in a laboratory setting and may be upsetting to some readers. Please proceed with caution.

Keeping a cat indoors is proven to increase their lifespan and reduce the risks of becoming injured or sick. However, it does limit their ability to exercise and explore the world. Fortunately, there are several ways that we can help bring the great outdoors to them, with window boxes, cat enclosures, and external walkways allowing them to engage in some wildlife watching without having a negative impact on the ecosystem.

Some cat parents want to give their cats a little more freedom by walking them on a leash, but it’s not necessarily as straightforward as it sounds.

If you’ve ever tried to put a harness on a cat, you will know that they are not always very happy about it. Some cats will grumble, some freeze or hug the walls, and many cats will fall onto their side when the harness goes on. This might seem a bit worrying at first, especially when some cats refuse to move, acting as though they are paralyzed. It can also be hard to resist having a giggle at the poor cat’s expense.

Some cats find harnesses particularly stressful, and we should never force them to wear one, but in most cases, cats will get used to this new accessory if given time, and you will be able to teach them to walk on a leash.

Although there are different theories, it all comes down to the feline somatosensory feedback system that acts like a 6th sense. When we put a harness on a cat, we are blocking their feline somatosensory feedback system.

divider 3 paws

Why Do Cats Fall Over When They Have a Harness On?

Various theories have been proposed to explain this quirky behavior, including:

1. Fight, Flight, or Freeze

When an animal is threatened, the sympathetic nervous system triggers a flood of adrenalin, preparing the body to fight, flee, or freeze. One theory is that cats falling over in a harness is part of the ‘freeze’ response to an unknown ‘threat.’


2. Pressure Points

This theory suggests that the pressure of the cat harness triggers the reflex experienced as kittens when picked up by their mother. Others have suggested that the pressure of the harness may cause a cat to ‘play dead’ as though they have been picked up by a predator.

black and white cat in a harness standing outdoors
Image Credit: Abis Photos, Shutterstock

3. Poorly Fitting Harness

A harness that is too tight or the wrong size can restrict movement, resulting in a floppy feline.

These theories aren’t necessarily wrong, but we believe we have found the real reason why cats fall over when wearing a harness.

divider 3 paws

Important note:

The study described below was part of medical research into human spinal nerve function and injury. It was not performed to address the question of cats and harnesses. We have used the results of this study to help understand how cats are affected by wearing a harness. Whilst the findings of this study are interesting and have implications in the treatment of certain neurological and spinal conditions, the content of the paper may be distressing to some of our readers as it does involve animal experimentation. Although the experiments were performed following the guidelines set out by the European Community Council Directive, they are not methods that we at Catster support or condone.

What Does The Science Say?

We have discovered a scientific explanation for this seemingly comical reaction to a harness, and it also explains why cats will eventually adjust to wearing one.

A 2012 experimental study looking at unconscious control of locomotion showed that cats were able to walk, maintaining balance and positioning, when the nerves controlling locomotion were electronically stimulated after their higher brain function had been surgically blocked. This rather unpleasant study demonstrated that in addition to conscious control of the body’s movements based on sight, hearing, vestibular system (part of the inner ear that controls balance), and sensation, feline balance, and coordination are significantly influenced, and even controlled, by unconscious somatosensory feedback from touch, vibration, temperature, air movement, etc.

It showed that the feline body can use the input from their surroundings to orient posture and gait without needing to process this information consciously. This also helps to explain the speed with which cats can react and move, their ability to balance on impossibly narrow surfaces, and how cats ‘always land on their feet.’ Most animals need to think before they leap, but the cat’s body can start to react without the delay of thinking. This also helps to explain why cats can easily adjust to a loss of vision and are able to walk, even jump, with confidence, like Svetlana, the blind cat.

Essentially, cats can walk in a straight line without higher brain function.

What Is the Effect of the Harness?

In a way, the feline somatosensory feedback system acts like a 6th sense—no, not the ability to see ghosts. So when we put a harness onto an unsuspecting cat, we are obscuring that sense, almost like putting a blindfold on, affecting their sense of balance and spatial awareness.

But, just like a blind cat gradually adjusting to their lack of visual input, your cat will adjust to how a harness affects their somatosensory input. Cats are very adaptable!

divider cats oct 2024

How to Get Your Cat Used to Wearing a Harness

Like with most things, harness training a cat is easiest when started at a young age, but that doesn’t mean adults, or even elderly cats, can’t be taught to wear a harness. Just follow these simple steps.

1. Create a Positive Association

Place the harness beside your cat as you give them treats or catnip. You can even rub catnip, calming pheromones, or calming scents into the harness to make it more appealing (N.B., only ~60% of cats react to catnip).

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!

2. Be Confident

Make sure you’re familiar with the design of the harness before attempting to put it on your cat. If you start fumbling with the clasps or are nervous, your cat will lose confidence and be more inclined to get away.


3. Leave the Harness on for 5 Minutes and Ignore Your Cat (Sort Of!)

Some cats will take to wearing a harness like a duck to water, but others may roll, run, or of course, fall over. Leave the harness on for around 5 minutes, keeping an eye on them, but otherwise allowing them to work things out on their own. If your cat is getting stressed, you may need to remove the harness and try again another time, but don’t force them to wear one if they show no signs of accepting it.

girl putting the harness to her tabby cat sitting in her stroller
Image Credit: Sergio Canovas, Shutterstock

4. DON’T LAUGH!

Cats are proud and sensitive creatures who do not take kindly to being laughed at, so keep your giggles to yourself, no matter how hard it may be.


5. Reward Your Cat and Remove the Harness

After 5 minutes (longer if your cat is tolerating the harness well) give your cat a treat or a fuss and remove the harness.


6. Next Time, Leave It on for 10 Minutes

Don’t leave too long an interval between sessions, and you can do more than one in a day, provided your cat isn’t getting stressed.

gray Sphynx cat wearing a cat harness outdoors
Image Credit: SuJo Studios, Shutterstock

7. Increase by 5 Minutes Each Time Until They Are Comfortable

Make sure they are walking confidently and without hesitation before stopping training. For older cats, this may take numerous sessions, but most cats will be getting the hang of things by the third or fourth time.


8. Leave the Harness on for Extended Periods but Only Under Supervision

Allow them to explore, eat, and sleep with the harness on so they are comfortable doing everything they would normally do while wearing it. But make sure you are watching them to ensure they don’t get into trouble.


9. Attach a Short Leash and Let Them Get Used to the Added Weight

Roll up the leash so it is attached to the harness but not dragging along the floor. I do not recommend retractable leads for cats as they are more likely to get these tangled, particularly if they panic.

cat with harness and leash in the park
Image Credit: Laura Sanchez Ubanell, Shutterstock

10. Make Sure Your Cat Is Comfortable and Confident Walking in Their Harness

By now, your cat should be ready to be walked on the leash. Do this indoors until you are happy that they aren’t able to escape before venturing out into the world. Some cats are super confident explorers, while others will be safer staying close to home.

divider cats oct 2024

Hot Tips & Important Bits

  • Cat harnesses are not the same as dog harnesses and need to fit well. Cats are master escape artists, so loose fit or thin straps will be no obstacle to a determined kitty. The ideal harness should be like a jacket or vest that is difficult to wriggle out of. I’m a huge fan of this one from Hepper because it comes in lots of different sizes. But it’s also hard to go past this sailor suit harness!
  • Most cats won’t walk on a leash like a dog, and more often than not, you will end up standing around at the end of the leash like a gooseberry while your cat explores. Don’t be tempted to get out your phone and start scrolling – distraction can lead to disaster.
  • Cats may panic and try to flee if they feel threatened, and a terrified cat can be difficult, even dangerous to hold. It’s a great idea to bring a cat carrier along with you in case you need to get your cat to safety.
  • A hungry cat is a food-motivated one; aim to do any training before a meal, not after.
  • Check that your cat’s microchip details are up to date in case of escape.
  • Stay away from trees! Your cat will no doubt love to explore new heights, but once that leash is wrapped around a branch, you’re in trouble.

divider cats oct 2024

Final Thoughts

If you’d like to help your indoor kitty explore the world safely, a harness and leash are a great option. Not all cats will be keen on this method, but many will start to look forward to their outdoor adventures.

A common phenomenon we see when first putting a harness on our cats is that they may freeze or fall over. This may seem a bit worrying at first, if not a little bit comical, but it is quite common.

Research into the feline somatosensory system has shown that their coordination, locomotion, and balance rely not just on information processed by the brain, but on feedback the body receives from the environment, enabling the body to move and orient itself without conscious control. When we place a harness on a cat, this feedback system is compromised, leaving cats feeling disoriented and off balance. In most cases, cats adjust to this change the longer they wear the harness, but it should not be forced upon cats that are becoming distressed.

By taking time to slowly introduce your cat to their harness, as well as making sure you have a great style and fit, you can have your feline friend safely exploring the world outside.


Featured Image Credit: Akifyeva S, Shutterstock

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