The behavior is so consistent across breeds and environments that researchers and veterinary behaviorists have spent real time studying it. The answers they’ve found touch on survival, instinct, comfort, and even neuroscience. Here’s what we know so far.
It’s Written Into Their DNA
Dog behaviorists believe that the need to perform this bedtime ritual of turning around in circles before lying down is inherited, with canine ancestors such as wild wolves doing the same thing, and domestic dogs retaining this genetic predisposition.
The behavior has persisted across countless generations and dozens of breeds, suggesting it’s deeply embedded rather than learned. Evolutionary behaviors like this one are aimed at self-preservation and are strong influences that persist for generations in the animal kingdom.
Veterinary behaviorist Dr. Karen Sueda, DVM, of the VCA West Los Angeles Animal Hospital, notes that while no one can be certain of the exact reason why canines do this, the ritual is likely a residual habit from the days when wolflike dogs lived out in the wild. The fact that modern dogs perform this on plush memory foam beds confirms it isn’t really about the surface at all.
Nesting: The Comfort Theory
In the wild, circling helped dogs flatten tall grass, clear out pests, and create a more comfortable and safe spot to rest. It was also a way to check the area for hidden threats before settling in for sleep. This nesting instinct is so primal that dogs carry it even when the “grass” is a fleece blanket.
Circling before lying down has been compared to the way humans fluff pillows and rearrange bedsheets before going to sleep. It’s a useful parallel. What reads as odd behavior is, in practice, just bedtime prep. For wild canines, turning around would help to flatten tall grass or leaves into a smooth, more comfortable space, with perhaps a side benefit of chasing away any unwanted pests like large insects.
The Stanley Coren Experiment
Stanley Coren, a professor emeritus in the Department of Psychology at the University of British Columbia and the author of multiple books on dog behavior, conducted his own survey of 62 dogs to test the “nesting” hypothesis. The study looked at whether the type of surface a dog was on influenced how often they circled.
The dogs were observed bedding down on either a smooth surface or an uneven surface like a thick shag rug, and he found that dogs were about three times more likely to circle on the uneven surface, with several dogs on that surface also scratching or digging before lying down. When dogs are presented with a soft, uneven surface, they are more likely to turn in circles before they lie down.
This particular set of data cannot say that it is the only reason that dogs turn in circles before resting, but it does indicate that one reason dogs are spinning about is to make themselves a more comfortable temporary “nest” to nap in.
A 360-Degree Safety Scan
Circling before lying down might also serve as a 360-degree safety check. Dogs’ ancestors could have circled to scan the environment and ensure their pack members were accounted for before going to sleep, or it could have been one last look out for approaching danger. Viewed this way, the spin is a final security sweep before vulnerability kicks in.
Turning in circles before lying down is an act of self-preservation, in that the dog may innately know that he needs to position himself in a certain way to ward off an attack in the wild. Even in the safety of a modern home, dogs maintain their instinct to check for threats before sleeping, and a dog might circle to face the door, keep their back to a wall, or position themselves where they can see the whole room.
Following the Wind
Some wildlife biologists believe that wolves sleep with their noses to the wind so they can quickly notice a threatening scent. Circling allows the wolf to determine the direction of the wind so he can best position himself, and with a quick whiff, the wolf knows that he may be in danger and is alerted for a potential attack.
A theory holds that this inherited trait of circling before lying down allows dogs to find the right position to align with the wind direction, putting them at an advantage to smell any scents that can alert them to danger. Even indoors, the instinct to orient by smell rather than sight is still very much active in most dogs.
Scent Marking and Territory
Dogs have scent glands in their paws, and circling before lying down may be their way of marking their territory. By pressing their paws into the ground, dogs leave their scent behind, signaling that the space is theirs, a behavior that can be traced back to their wild ancestors who needed to claim and defend their territory from other animals.
Dogs have specialized scent glands located in their paws, and when they circle, these glands are activated, helping them to mark their chosen resting place with their unique scent. This territorial marking signals to other animals that the space is occupied, securing their spot for undisturbed rest. It’s a quiet but effective form of communication that requires no sound at all.