Digging is a natural behavior for dogs that stems from their ancestry.
Wild canines would dig for various reasons such as creating dens, hiding food, or cooling off in hot weather.
Even though domesticated dogs might not need to do these things for survival, the instinct to dig remains strong.
Dogs, especially those left alone for long periods, may resort to digging as a way to alleviate boredom and expend excess energy.
Dogs might dig to create a comfortable resting spot, especially in warm weather when the ground is cooler.
Some breeds have a strong prey drive, and digging can be a manifestation of their instinct to hunt small animals like rodents.
If a dog is feeling anxious, scared, or confined, they may attempt to dig under a fence or barrier to escape.