Dogs bury things as an instinctual behavior inherited from their wild ancestors.  

This action served to hide food for later consumption, ensuring survival.  

Burying items also satisfies a natural urge to create a secure and comfortable space. 

Dogs may bury possessions to mark their territory and establish a sense of ownership 

Additionally, it can be a response to stress or anxiety, offering a coping mechanism.  

The cool, damp earth can preserve items and mask scents, reflecting their primal instincts. 

Burying toys or bones can be a form of play and a way to engage in natural behaviors.