there are two answers to this question. One is that they have this special sense, and that they are building an imaginary wall to keep out of evil. I personally think that's a lie, but my teacher told me. The other is that their ancestors, the wolves, had to flatten out the grass to sleep on it. That instinct has been passed down, so now domesticated dogs do it today, too. hope that helps! :)
EDIT: the first one is a lie sorry but your teachers mean
Dogs often run in counterclockwise circles just because they are excited. While some dogs seem to turn only in one direction, other dogs will run in clockwise circles, and some dogs will do both, at different times.
They are marking their territory before they lay down.
In my opinion, dogs look for the spot they are most comfortable with! Lol It all goes back to the days when wolves used to circle their sleeping spot to tred down the straw or hay they would sleep on for comfort
Dogs may scratch at the bedding as an instinctual behavior to create a bed or nest-like area before lying down. This behavior can also help them to mark their territory with their scent or to adjust the bedding to make it more comfortable.
Scientists believe dogs turn in circles to stomp down grass and weeds to give the dog a place to defecate. Other theories include looking for predators and finding the best place to mark their territories.
n o no
Dogs have nerves that tell them how to do things it genetic ly forces
Dogs often run in counterclockwise circles just because they are excited. While some dogs seem to turn only in one direction, other dogs will run in clockwise circles, and some dogs will do both, at different times.
In addition its an act such as human fluffing their pillows.
Hold your stylus down when the dogs laying down
He/she could be doing it for fun, or maybe because he/she is bored. If he/she does it before sitting or lying down, that is a natural behavior of both dogs and cats before sitting or lying down. In their wild environment, that would help to pat down tall grass so they could have a comfortable place to sit or lie down.
If your dog is circling before lying down to take a nap, this is pretty typical dog behavior and is normal. If your dog is walking in circles without a reason (such as circling a toy or a new object in the yard), this can be a sign of brain disease and should be examined by a veterinarian as soon as possible. Dogs can get infections of the lining of the brain, and certain breeds are more likely to have these infections, and the sooner the infection is treated the better the outcome is likely to be.
Canine circling behavior probably developed when dogs were living in the wild. Eating and sleeping are two activities that leave an animal vulnerable to attack; therefore, before feeding or lying down, a canine circles up to three times to check for possible rivals or assailants. Even housepets with few to no threats exhibit this behavior because it is instinctual, "hard-wired" into the animal.
Cats scratch the bed before lying down to mark their territory with scent glands in their paws and to stretch their muscles.
It has been suggested that dogs and cats turn round before lying down because when they sleep on grass they are more comfortable if the grass has been flattened. This is naturally a part of them so they naturally turn around before lying down.
Cats dig before lying down to create a comfortable and safe spot to rest. This behavior is instinctual and helps them feel secure and relaxed.
Cats knead before lying down as a behavior from kittenhood, associated with comfort and security. It may also help them mark their territory with scent glands in their paws.