* Instinct: Dogs have an instinctual urge to dig and create dens. This behavior stems from their wild ancestors who needed to dig for shelter, food, and to hide from predators. Pillows can provide a similar feeling of security and comfort.
* Comfort: Pillows offer a soft, warm, and cozy place to rest. The weight of the pillows can also be comforting and soothing.
* Temperature Regulation: Dogs use their paws to regulate their temperature. The coolness of the pillow can help them stay cool on a hot day.
* Boredom or Anxiety: If a dog is bored or anxious, they might engage in digging behaviors like burying in pillows to occupy their time and release pent-up energy.
It's important to note that while pillow burying is a common behavior, it's also important to make sure your Shih-Tzu has enough space and comfortable bedding to rest without needing to dig into your pillows. If your dog is excessively destructive or anxious, consult with a veterinarian or certified dog trainer for advice.