Why your dog’s tail may be retractable and why it’s not a problem

If your dog is a “dolphin” then it’s likely that his tail is actually a leash.Dolphin tails are made from keratin, a collagen-based material, and they’re used to hold up the body.Keratin is often used as a protective coating on items like furniture, clothing, and even human skin.In fact, it’s a very common material used …