This behaviour goes back to their wild ancesters days. Dogs in the wild would use any grass, ferns, foilage etc. to make a bed, digging it around and then circling on it to make it a little more comfy.
Sherry does it A LOT to the point of being obsessive about it. This could be because until I got her she lived on a farm outside so I doubt she had nice comfy blankies to sleep on. Rosa doesn't do it much at all.
That is adorable. Shiloh does this every night. He walks in a circle to the left 4 times, then to the right 3 times and then lays down. First, he has to fluff and pull his covers.
If we're watching TV in the den, he'll run and get one of my or my husbands shirts and bring it with him to the den. Then he'll put the shirt in a chair and follow the same digging and fluffing. It is the cutest thing!
Ben digs when he wants to be let under the covers. To speed up the process I have gotten into the habit of just lifting them for him. If I am in the bed alone (BF is at work) then Ben will get under the covers and do some digging and spinning. He doesn't do this when there are two humans in the bed though.
When he finally settles in, he lets out a loud exhale. I love it. I finally know he has settled and I can settle as well.
I have always wondered about this too. Coco does this right before he goes to sleep, then he circles around the area, lays down and lets out a big sigh. It's funny because my bf & I often say whenever he sighs like that it sounds like he is saying Boy, what a rough day
In fact, Maggie is doing it right now. She digs and turns and fluffs and jumps around. I don't know how she knows when her spot is ready because it always looks about the same to me but she will not settle until the blankets are exactly the way she wants.