Why Do Cats Shake Their Heads?
Live Science
WHY CATS SHAKE THEIR HEADS
Cats often flick their heads back and forth as if they've been possessed. This strange reflex has a simple explanation. Most cat owners are familiar with the funny head shake their pets do, often after eating, drinking or enjoying a nice cheek scratch — they flick their head back and forth a mile a minute.
Dogs and other mammals are known to show similar behaviors. So why do our furry friends shake like this, and does it mean something is wrong? Usually, this head shaking is totally normal, experts told Live Science. However, the reasons for it can vary a bit between cats and dogs.
STIMULATION
Cats shake their heads when the nerve endings on their heads are stimulated, Sarah Crowley, an anthrozoologist at the University of Exeter in England, told Live Science.
"The physiological driver for it is stimulation of the very sensitive hairs and nerve endings around the top of the head, particularly around the ears," she said.
These nerve endings can be stimulated by a satisfying scratch, prompting the kitty to shake it off. "If a caregiver has touched a sensitive area" — for example, around the ears or whiskers —"this may result in a head shake," said Amy Miele, a clinical animal behavior lecturer at The Royal (Dick) School of Veterinary Studies at the University of Edinburgh in Scotland.
This rapid swinging motion is very effective at dislodging obstructions, such as food or drink, from the cat's ears or whiskers. It can also help to resettle their fur, Crowley added. "Often the head shake is followed by grooming of the face [or] ears," Miele told Live Science in an email.
OR ANNOYANCE
The rapid head toss can also indicate annoyance. It's often a response to having their ear blown on — not something you should do on purpose, as they don't like it. Thankfully, this erratic side-to-side motion doesn't usually cause dizziness. "Animals (including humans) are more likely to make themselves dizzy by spinning in circles," Miele said.
Cats aren't the only animal with these silly shakes. "Lots of mammals have this head shake reflex to something in or around their ears," Crowley said. "You see mice and rats do it when they've been eating and drinking." In dogs, breeds with upright ears, like German shepherds, are more likely to shake their heads than floppy-eared pups such as King Charles spaniels because it's easier to get something (like a grass seed or insect) stuck in an open ear.
OR PLAY
Dog owners might recognize other types of shakes: the predatory shake (when your pooch tries to playfully "kill" its toys by whipping its head from side to side while its "prey" is in its mouth) and the full-body shake, sometimes called the "wet dog shake." "It starts at the head and then rolls down the whole body and ends at the tail," Crowley said. This is the kind of post-bath shake that soaks everything in your bathroom before you've had a chance to dry Fido with a fluffy towel.
OR TRANSITION
The full-body shake can also indicate a transition between places or behavioral states — for example, if the pup just experienced something stressful or exciting. "This 'shake off' is a way of helping the animal to relieve tension and reset emotionally and physically," Miele said.
"It could be after quite an intense play session with another dog that was really fun," Crowley added. "You often see both dogs will finish playing, and then they'll both shake, and then they'll go do something else."
WHEN TO BE CONCERNED
Although head shaking can be normal, if your pet starts doing it more often, in unusual circumstances, or while scratching or tilting their head, it might indicate a medical issue, such as an infection, parasite, irritation, neurological problem or something lodged in their ear. "It's painful and uncomfortable, and that's the only thing that they can do, apart from stick their foot in it," Crowley said.
If you're concerned about your pet's head shaking, consult your vet. "If ear infections are left untreated, then this can result in hearing loss and risks the infection spreading beyond the tympanic membrane (ear drum) and into the middle ear, causing problems with balance and resulting in the animal becoming very unwell," Miele said.
For the most part, though, head shaking is just an adorably normal behavior that helps your pet stay clean and comfortable.
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