The Shiba Inu is a small dog close genetically to wolves. So they still retain some habits from their wild period.
One of their habits, except for the hierarchical relationship I mentioned earlier, is to dig holes.
In the past, dogs dug burrows in slopes such as mountains and lived in them.
Even now, dogs prefer narrow and dark places, which is said to be a remnant of this habit.
Also, if you observe a pregnant mother dog or a small puppy, you will see that they will often dig on an empty floor. These behaviors are rooted in instinct.
This instinct is especially evident when the dog is under a lot of stress, such as when pregnant or sick, and will try to hide in small spaces, such as between large furniture or under a bed.
When this happens, it is a good idea for owners to provide a small space where the dog can feel safe.
However, it is important to be careful because dogs will try to hide a shoe or ball they have picked up in a small space.
This is also a remnant of the way they used to hide food they caught in their burrows when they were in the wild, but it is a bit annoying to humans.
If you lose a remote control or something, you might want to look for it.