u/Similar-Equipment-49

9ish year old mutt, we’ve had him for 7 years. Over the last 3 or so he’s gradually developed this bald spot on his tail. It was so gradual that we didn’t notice it until people started mentioning it and then I looked back at pictures/videos and sure enough he didn’t use to have it. He’s in great health, doesn’t chew at it or have any other skin issues. No signs that it bothers him. Is there anything we can do to stop it and to regrow the hair there?