Why Do Cats Hiss? The Curious Link Between Cats and Snakes
Facebook Pinterest Twitter

Why Do Cats Hiss? The Curious Link Between Cats and Snakes

Est. read time: 5 min.

Those of us at Litter-Robot don’t normally pay as much attention to cold-blooded vertebrates as we do four-legged furry mammals. But because October 21 is Reptile Awareness Day, we started thinking about the odd parallels between cats and one quintessential reptile in particular: snakes. Without further ado, let’s take a look at the curious links between cats and snakes, starting with: Why do cats hiss?


Many animals hissbut chances are, the first two hissy animals you think of are cats and snakes. Snakes have an organ in the throat called the glottis that they breathe through. Normally this is a quiet process, but by forcibly expelling air from the glottis, the telltale hissing sound emerges. Snakes hiss as a defensive tacticone that is especially useful for small, non-venomous snakes. A hissing snake can give the impression of a larger, more dangerous foe.

So why do cats hiss? Believe it or not, cats are actually imitating snakes when they hiss! Snakes are seen as some of the most fearsome predators in the animal kingdom. Just like snakes, cats hiss to sound intimidating and to try to scare away whatever is threatening them.

Litter-Robot resident veterinarian Dr. Justine Lee explains that by changing the shape of their tongue and pharynx (the tissue right in front of their voice box), cats are able to sharply release a jet of air while spitting some saliva in the process.

Along with hissing, cats may let out a guttural growling sound when feeling especially defensive. Amazingly, certain snake species growl, tooincluding the King Cobra. (As if they weren’t frightening enough!)

cat vertical pupils

Vertical pupils

Cats and snakes both bare mesmerizing, if not slightly sinister, vertical-slit pupils. According to research published in the journal Science Advances, vertical pupils are most common among nocturnal predators that ambush their prey. The vertical slits of cats, snakes, crocodiles, and other “ambush specialists” create a greater depth of field and distance judgment than other pupil shapeswhich is essential for low-lying predators that kill by pouncing. The slits also allow these animals to see in dim conditions while not being blinded in bright light.

Interestingly, the research also concluded that goats, sheep, and other prey animals bare strange horizontal-shaped pupils to see panoramically on the ground with minimal blind spots, in order to detect approaching predators. Active animal hunters that chase down their preysuch as dogs, wolves, lions, and tigershave round pupils.

Ancient clashes

Egyptian, Buddhist, Kabbalist, and North American imagery historically link cats and snakes. In particular, ancient Egypt closely depicts these two animals.

In ancient Egypt, cats were praised and even worshipped for their abilities to kill loathsome creaturesnamely snakes. The Egyptian goddesses Bastet and Mafdet were both depicted as feline deities that protected the people against snakes and scorpions. The Egyptian Book of the Dead describes the eternal struggle between the sun god Ra and the Great Serpent Apophis. In the story, Ra journeys across the sky each day, and each evening slips beneath the horizon to enter the underworld. There, embodying the “Great Tomcat” or Mau, Ra confronts and kills the evil snake-demon Apophis, who is darkness and chaosthereby allowing Ra to return to the world in the morning as the shining sun.


Cats and snakes have long been tied up in superstitions. Since the Middle Ages, black cats and snakes were thought to be the familiars of witches, and therefore linked to the Devil. Unfortunately, seeing black cats and snakes as bad luck omens persists even to this day.

The bubonic plague was often attributed to both cats and snakesand a great many were destroyed because of it, leaving the real cause of the plague (rats carrying the Oriental flea) able to run rampant.

A Celtic proverb claims that kittens born in May will never catch mice or rats, but will become adult cats that bring snakes indoors.

Finally, it’s been said that to dream of seeing a cat and snake on friendly terms signifies the beginning of an angry struggle. Me-ow!  

cat paw on snake © Umberto Salvagnin / Flickr / CC-BY-SA-2.0

What if my cat gets bit by a snake?

All superstition aside, what about when cats and snakes meet for real? As we explained earlier when we asked “why do cats hiss?” cats and snakes are generally on the defensive and unlikely to get into a quarrel with each other in the wild.

If, however, you believe your cat may have been bit by a snake, watch out for these symptoms:

  • Two fang marks accompanied by pain and swelling (this may indicate a poisonous bite)
  • U-shaped bite accompanied by pain (this may indicate a non-poisonous bite)
  • Pale or white cat gums
  • Rapid heartbeat
  • Rapid breathing or difficulty breathing
  • Vomiting
  • Paralysis
  • Convulsions

Treatment should begin as soon as possible after the bite:

  1. Approach your cat carefully. If your cat is nervous or anxious, restrain him if necessary.
  2. Clip the hair from the bite area on the cat.
  3. Flush the area thoroughly with sterile saline solution, if possible.
  4. Transport your cat to the veterinarian immediately. If the snake was killed, bring it to the veterinarian for identification. Otherwise, try to remember identifying marks.

From wondering why do cats hiss to learning about these animals’ ancient history with each other, we’ve discovered that biology and society link cats and snakes in all sorts of curious (and often unfortunate) ways. Please consider that what cats and snakes need most from us humanstruly the most dangerous predator of allis compassion and care of their natural habitat.

cats and snakes why do cats hiss


11 reasons why