Dogs Dig Up the Yard Out of Instinct
If you notice your dog has been digging, you shouldn’t worry about this behavior — although you might want to be concerned about your lawn! Dogs dig to either hide or uncover their valuables, whether it is a toy, bone, or anything that they want for safe keeping.
More feral dogs dig holes in order to find prey in underground tunnel systems, or to lay their dead young in a safe place to rest. Without proper training, it’s likely that your dog will continue to dig out of instinct.