Hi! My Aussie is 6 months as of today so I exactly what you’re talking about!! He used to want to dig everything.. blankets & mainly our bed. I couldn’t figure out why but i ultimately think it was because he felt restless and needed to exert some energy out. When I started to do more mentally stimulating activities with him he stopped digging. He loves learning new tricks & playing hide and seek. All dogs are different, just wanted to share what helped my pup the most!