Understanding a cat arched back

Updated 14/06/2024

The cat arched back is one of the most striking and iconic poses shown by our feline friends. 

This body language, sometimes known as the “Halloween cat pose”, is when our fur pals arch their backs upwards, creating a distinct curve. This posture is often paired with other behaviors such as raised hind legs, a lowered head, and sometimes a raised tail.

When feline flexibility meets fur-tastic communication, an arched back in cats can signify many different kitty emotions – from being content, distressed, or anywhere in between.

So if you’re wondering “why do cats arch their back when you pet them?” or “why do cats raise their backs when scared?”, this article delves into the purr-plexing reasons behind a cat's arched back and aims to answer these questions and more.

The flexibility and anatomy of cats

Cats, the yogis of the animal kingdom, are known for their great flexibility. This is due to the unique anatomy of a cat’s body. They have elastic cushioning between their vertebrae (back bones) which helps them to twist and bend much more easily than we can. This gives them an unparalleled range of motion and agility. It also allows them to arch their back dramatically, making an arch reminiscent of a furry rainbow.

Why do cats arch their backs?

Understanding the reason for your cat's arched back requires us to take note of the context of this cat behavior. This involves observing other body language cues and the surrounding environment.

External factors, such as environmental stressors or underlying behavioral issues, can also contribute to the cat arch back. 

To help you assess your four-legged friend's well-being and intentions we’ve compiled a list of reasons why cats may arch their backs: 

Stretching and relaxation

A cat may arch their back as part of their stretching routine, particularly after waking from a nap. This “cat pose” helps to wake up their muscles and maintain flexibility, allowing them to showcase their best catwalk moves with graceful movements.

Display of fear and aggression

In contrast, an arched back, combined with raised fur, a hiss growl, spitting and showing their teeth serves as a warning sign that your cat is afraid or feeling threatened. Our small but mighty friends can make themselves appear larger to assert their dominance and ward off potential dangers. 

Playful behavior

Kittens, in particular, often exhibit arched backs during playtime. This feline behavior mimics their instinctual hunting behaviors, as they engage in adorable mock attacks and pounce on imaginary prey with boundless energy and dilated pupils.

During petting

If your cat arches their back when petted, it shows they’re enjoying a scratch or pet from their humans. By pressing into the gentle strokes of their pet parent or pet sitter's hand, they show their relaxation and love.

Indications of pain

While often overlooked, a cat’s arching can also signal discomfort or pain. Persistent arching, especially in specific circumstances or coupled with other symptoms such as a decrease in appetite or mobility issues, may signify something’s up. If you’re worried about your arch back cat, speak to your vet for advice.

Marking territory

If your kitty arches their back while urine spraying, it may be to do with territorial marking behavior, particularly in unneutered male cats. 

How to respond to a cat’s arched back

Knowing how to respond to a cat's arched back is important in ensuring a harmonious relationship between you and your beloved furball. Here are some tips on how to react to your cat’s arched back depending on the situation:

• If your arching cat seems to be in distress, aim to remove all stressors and threats to calm your cat down or give them space.
• If your moggy appears to be content and their arched back is them initiating attention or play, give them as many cuddles and attention to your heart's content!
• As always, if you’re ever worried about your cat’s arched back, it’s important to seek advice from your veterinarian, especially if they’re displaying any other concerning symptoms. 

What is lordosis in a cat?

Lordosis is a medical condition that refers to an exaggerated and distorted spine, with an inward curve. It can lead to pain for affected kitties but your vet can help.

However, the term lordosis is often used to describe the position a female cat makes when she is in heat and is ready to mate. Female cats are not in pain when they do this, despite the noises they make when calling for a male.

Meet our veterinary expert, Rebecca

This article has been checked by veterinarian Rebecca MacMillan, BVetMed MRCVS. Rebecca is a companion animal vet who has always had a passion for writing and client communication. Since her graduation from the Royal Veterinary college in 2009 she has gained a wealth of experience in first opinion small animal practice, in both clinical and managerial roles. She currently works in the South West and deals with a variety of routine and emergency appointments, but particularly enjoys medicine cases. Outside of work and writing, she enjoys spending time with her family, including her bouncy flat coated retriever George!

If you’re concerned or want to know more about cats’ arched back behavior, members of TrustedHousesitters can benefit from our 24/7 Vet Advice Line. Our trusted team offers pet sitters and cat owners on certain plans advice on cat care and cat health.