Why do dogs scratch their beds before lying down?

Scratching the ground is away to spread their scent and mark their territory, communicating to other dogs or animals that this is their nest or place of rest. Scratching the floor was also a way for them to create a shallow nest where they can retain body heat in case they were sleeping in the cold.

Why does my dog dig on my bed when excited?

At times of high excitement or stress, you may see your dog digging and pawing with no apparent purpose. She may want to chase a bird she sees outside but cannot get to, so instead she digs at the carpet or chair to release some of that anxious energy

Why do dogs dig in pillows and blankets?

The Root of the Behavior First, it is because wolves and wild dogs dig a den to be secure and safe. So this behavior is based on them feeling secure. The other reason is that their instincts tell them to conceal their bedding from predators.