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How Big Is a Cat Brain? 5 Vet-Approved Facts

Annaliese Morgan

By Annaliese Morgan

close up of calico cat

Vet approved

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Reviewed & Fact-Checked By

Dr. Amanda Charles

Veterinarian, BVSc GPCert (Derm) MRCVS

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

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One might assume because cats are considered intelligent, quick, sharp, and smart that they must have a big brain or at least a decent-sized one. Surprisingly, a cat’s brain is relatively small when compared to other species. It is only around 5 centimeters (2 inches)—not much bigger than your pinky finger, weighing in at around an ounce or 25–30 grams. A cat’s brain accounts for just under 1% of its body mass, compared to about 2% in a human and about 1.2% in dogs, and contains around 300 million neurons 1.

Felines are fascinating creatures, displaying and acting with a lot of intelligence, and can even pick on emotions and emotional states from their owner, which figures, given a cat’s brain structure, is 90% similar to our human ones. While research into the cat’s brain is still fairly low, it is ongoing, with new information being discovered as time progresses. But what are some interesting facts we know about the feline brain already?

The 5 Cat Brain Facts

1. Cats Dream

You may be surprised to read that when your cat is asleep and they become twitchy, wiggle their feet, swish their tail, or move their lips, they are more than likely dreaming, and it is not merely a myth. Like humans, cats enter the stages of both rapid eye movement (REM sleep) and non-rapid eye movement sleep 2. It is during the rapid eye movement portion of their sleep that it is believed your feline embarks on their dreams in the same way humans do, although we do not yet know the quality of the dreams cats have 3.

Cat sleeping on a warm cozy bed
Image Credit: Александар Цветановић, Pexels

2. Their Long-Term Memory May Be Better Than Their Short-Term Memory

Memory is one function and ability of the cerebral cortex part of the brain. It stores information (from the past mostly) and is used as a recall center to judge a current event or situation, solve problems, or learn new skills. Memory is how a kitten learns actions, habits, and behaviors from their mother and environment.

Cats, the same as humans, also possess long- and short-term memory, but in cats, long-term memory is thought to be more refined and superior than their short-term memory.

Contrary to popular belief a cat can be trained, either by using positive reward training much like we do in dogs or by simply observing their human owner repeatedly undertaking a task, like opening a cupboard door. Don’t be surprised if they copy you one day! Factors such as diet, human interaction, age, and intelligence all affect their memory ability.

3. They Can Recognize Voices

Although not researched widely and in-depth, in 2013 a study found that cats can indeed recognize the voice of their owners, indicating that cats can use vocal recognition alone in recognizing humans 4. They demonstrate recognition of the voice by orientation behavior (ear and head movement), not behavior (tail movement and vocalization).

woman cradling a black and white cat
Image Credit: Helena Lopes, Pexels

4. They Have Sensorimotor Intelligence

Experiments have shown that cats do not fall for objects or items disappearing. Known as object permanence, it refers to an object, a toy for example, that has been placed out of sight and no longer visible. As adult humans, we know the object is still there even though we can’t see it, but many animals and even young babies don’t know this or possess this perception, and they believe the item has literally gone.

Cats, however, are not fooled and don’t believe this and know very well the prize or object of interest and intrigue is still there! They will often sit waiting for it to return or poke around looking for it. This is an especially useful skill in hunting and catching prey, and they can also use it for determining hidden items in boxes or containers

5. There Are Age-Related Neurological Disorders

Cats can suffer from age related cognitive dysfunction. Signs of this condition include: disorientation, excessive sleeping, changes in their sleep-wake pattern, toileting outside the litter tray and loud vocalizing. Many of the signs resemble those seen in humans with dementia or Alzheimer’s disease. It has been noted by animal behaviorists and specialists that cat owners themselves play a role in dramatically delaying senile behavior and disabilities in older cats.

senior woman petting old cat
Image Credit: Alina Troeva, Shutterstock


The brain and its functions are a complex and interesting part of the body, capable of far more than we may ever understand. There are numerous abilities of the brain, enough to write books on, but it is interesting to note how the cat’s brain is designed and functions exactly how felines need it to in order to survive and enjoy their lives.

While more information will surely unravel over the years, it’s certain from these five facts alone that cats are exceptionally clever creatures, and it is an intelligence to be respected not underestimated.

Featured Image Credit: Svetlbel, Pixabay

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