Skip to main content

Why cats arch their backs (it’s not always aggression)

There are several reasons for this normal cat behavior

European Shorthair cat hissing and arching back with hair standing up
yhelfman / Shutterstock

Cat owners and non-owners alike have seen the famous Halloween symbol of a black cat with their back arched and hairs raised. The accompanying yowl can be heard in just about every Halloween movie ever made, but it’s entirely different when a cat arches their back in real life. In books and movies, though, cats only seem to arch their backs out of aggression or fear. It’s almost never a good thing!

However, a cat’s arched back can mean many different things. True, it can be a fear reaction or an attempt at threatening another cat, but it can also be a reaction to completely normal, nonchalant things. These are the most common reasons why a cat might arch their back.

A cat’s arched back can be a sign of aggression or defensiveness

fantom_rd / Shutterstock

Although this isn’t always the case, cats sometimes do arch their backs out of fear or intimidation. This may be a knee-jerk reaction to a shocking surprise (and may be accompanied by a yowl, hiss, or growl), or it could be a way that a feline intentionally scares off another cat or animal.

When a cat arches their back, the hairs on their body also stand up. These postural changes help them appear bigger and more intimidating, which can be helpful in the face of a challenge or threat. It’s no wonder why this symbol is so commonly associated with Halloween.

Many cats arch their backs while stretching

A gray tabby cat stretches on a motorbike seat
Srinivasan Venkataraman / Unsplash

Many times, a cat-arched back is nothing more than a really good stretch. Whether they’re waking up after a long nap in the sunshine or are limbering up before playtime, you might notice an arched back while they’re stretching their spine. They won’t stay in this position for long, and they’ll likely move into and out of it more slowly than when in a defensive situation.

When your cat is stretching, you may also notice them yawning, sighing, or closing their eyes. Stretches are fairly obvious. If your cat is licking itself while arching its back, the odds are that it is just supporting itself while grooming in a hard-to-reach area.

Cats may arch their backs during petting sessions

Orange cat arched back while being pet
Christin Hume / Unsplash

Other times, you may see your feline friend arch their back into your hands while you’re petting them. Take it as a compliment. This means that they’re thoroughly enjoying the scratching or massage, and they’re leaning in to get you to apply a little more pressure. If your pet cat is doing this, you may have found a sweet spot. Keep the scratches coming!

A cat-arched back can be a sign of play

A gray tabby cat stands in the street with an arched back
Yehoshua Halevi / Shutterstock

Occasionally, a cat arches their back while playing, even if it may look like they’re scared or surprised at first glance. The fast-paced movement of play can easily be mistaken for a negative reaction, but it’s totally normal to see your feline friend arching their back before pouncing on a toy. They may even jump sideways with their bodies in a similar position as a fear-based arch, but their fur won’t be standing up like it would be if they were feeling aggressive.

It can look startling when a cat approaches you and suddenly arches their back, but this can be an odd way that cats ask their owners to play. This is why paying attention to other cat body language signals is so important; it can help you distinguish between a truly fearful reaction and a meaningless change in posture.

What to do when your cat arches their back

A black and white cat arches their back
Aleksandra Duda / Shutterstock

Most of the time, you don’t need to do anything at all. If your kitty is arching their back out of surprise, they’ll quickly return to a more relaxed state. If they’re feeling afraid, however, you can also look for feline body language signs, such as “raised fur, a bushy tail, flattened ears, pulled-back whiskers, and dilated pupils.” As the cat experts at Sheba explain, a swishing tail can also be a sign of an angry kitty.

To give your cat a helping paw, try looking for what they’re reacting to. You might be able to remove the source of their fear. If they’re reacting to another animal, however, you’ll have to think more carefully about how to proceed without escalating the situation. When your cat is arching their back, though, make sure not to approach them or pick them up, as they can take this as a sign of an attack.

Instead, pretend your reactive feline is an angsty teenager and simply let them cool off. You don’t need to do anything at all if your buddy is stretching, grooming, or trying to play, but if your cat is arching their back, it’s normal to want to figure out why.

Now that you know what you do about cat-arched backs, you can navigate reactive situations with ease and confidence. You’ll know right off the bat when it’s time to give your kitty some space, and you’ll understand when it’s time to play. It’s like reading your cat’s mind.

Gabrielle LaFrank
Gabrielle LaFrank has written for sites such as Psych2Go, Elite Daily, and, currently, PawTracks. When she's not writing, you…
Can cats see in the dark? We separate fact from fiction
Cats have night vision far superior than our own, but they still need light to see
A cat stares into the camera

When something goes bump in the night, you might wake up in a panic, only to realize it's just the cat. These beasties are well known for being up and about in the wee hours of the morning, ready to play, hunt, and eat. While it's true that cats love nighttime, they aren't actually nocturnal. Instead, they exist in an in-between state as crepuscular, meaning your feline will love dusk and dawn most. So, if they aren't actually night owls, can cats see in the dark? We break down what cat vision really looks like.
Can cats see in the dark?

Almost all of us can see something in the dark, but night vision varies considerably among different animals. Owls have particularly good night vision, while humans less so. Cats see about six times better than people at night, which helps them hunt successfully at twilight, in the wild, or from your backyard. But it's inaccurate to say they can see in pure darkness. Instead, kitties have special eyes that allow them to observe a lot more in low light. These are the three main ways cats see better at night.
Smart design
Cat eyes look totally different from human ones, and they are. Feline orbs have special qualities designed to help them hunt in near darkness, such as a curved cornea and large lens (we'll get into what's up with the pupils next). You may have heard of rods and cones, the parts of the eye that help us see light and color, among other things. Our furry friends have more rods and so see more light, and therefore, need less of it (by contrast, we have more cones and observe more colors). Lastly, cats have something called a tapetum that reflects light to the retina. While you may never have heard this term, you've definitely witnessed it in action — this is why cat eyes glow in the dark.
Pupil dilation
When the lights go off, our pupils get bigger, and it's the same with cats. However, our pet's pupils can go from a small vertical slit to a massive globe. As the eye grows larger, it does lose some clarity, otherwise you might expect to find your animal's eyes constantly at full blast. Generally, during the day, their pupils will show up as a thin line for maximum focus and then dilate as needed in dim-light situations. And the growth is an enormous difference, up to 300 times the size of their eye at its smallest.
Myopia
Myopia is the fancy word for near-sightedness or the ability to see up close but not far away. Many humans wear glasses to improve their vision, but unfortunately, cats don't ever see as well as we do at a distance. The little buds have a wider frame of vision, but everything would look a bit blurry if you adopted their eyes temporarily. In a competition for who can spot a tiny movement, like prey burrowing in the grass, the cat would win.
How cats see the world around us

Read more
Why do cats like boxes so much? It’s not just because they’re weird
Why are some cats obsessed with cardboard boxes?
Cat sitting inside of a cardboard box

Cat owners have all been there: You order your cat a new cat bed, cat tree, or other item that comes packed in a box. When you unpack the item, your cat inevitably plays with the box more than he uses the item that came with it. This adoration of boxes is plenty common in cats, but it also seems a little odd.

Boxes are basic; there's nothing especially exciting about them — or at least that's what you might think. To your cat, however, boxes are tempting for many reasons, and they're the perfect space to explore, sleep, and play in. But let's dive in deeper: Why do cats like boxes, exactly?

Read more
8 essential things you should be doing now to promote cat health
Keep track of these things to give your kitty a long life
A close-up of a peach and gray calico cat with amber eyes.

We believe sharing your home with any animal enriches life and makes you a happier, healthier person — and research agrees. But did you know that cats might actually be better for your health than dogs? According to a University of Minnesota study, owning a cat lowers your risk of suffering from a heart attack by an impressive 30 percent, likely more than that conferred by owning a dog, though results of research vary. (Don't worry, dog lovers. Research shows you're still happier and healthier than people who don't own any pets.) 

Considering how much your cat improves your health, it's only fair for you to keep a close eye on her well-being. We're here to help, so we've compiled a list of the most common forms of kitty illness and what you can do to promote cat health. 
#1: Monitor your cat's weight and activity level

Read more