Poor Astro. Not twice, that's for sure, but Jaynie tore the nail off a dewclaw while tearing around the back yard last year. In her case it was clearly painful, so I took her to the vet who shaved it off and put her on Tramadol for a few days. As you are doing, we didn't bandage it, but did keep an eye on her so that she wouldn't lick. This meant she got to sleep in bed at night which is supposed to be a Rickie-only privilege, so it wasn't too hard on her
The nail did grow back, and has since been very easy to keep short on "dremel Wednesdays".
Hope Astro heals well and quickly.