My Aussie Shepherds chewed the walls, furniture, countless plants and nearly everything else that wasn't nailed down. The icky stories I could tell you of coming home from a hard day at work and praying the yard was not destroyed. At 8 months, I would dare to say it's the age of the puppy. You can buy puppy vitamins that work well, but unfortunately, I would resign myself to the fact that things will be chewed up for a while around your house.