Dogs crawl into nooks and crannies because they are generally insecure, timid, frightened, or sick. The specific reasons need to be judged based on the dog's condition. If a stranger comes to the house or hears a noise, the dog will feel scared. At this time, he will find hidden corners such as under the bed, under the table, under the sofa, etc. to hide to gain a sense of security.
Tip:
If the weather is hot, dogs will also choose a hidden and cool location to escape the heat.