My poor dog. Help :(

Angelina • 26. 9 years w/ my love. Married 💍 I'm an artist, nature lover, Crystal collector, mommy to 2 doggies and our babies, Lilliana 5/26/16 & Elena 5/10/19
Not really sure where to post this but
My dog has anxiety and because of that she chases and chews on her tail. We haven't been able to get her to stop and the tip of her tail now is like a small open wound. We've been cleaning it with hydrogen peroxide so it doesn't get infected but she won't leave it alone long enough to let it close and heal. Anything I can put on it to help it heal faster but also safe for her to eat if she licks it?