I did a quick search to see if there were any rescues in Michigan that specialized in older dogs and found this:
Jethro's Place Animal Sanctuary, Ferndale, MI,
has a wonderful website that features the senior dogs currently in their guardianship. The sanctuary makes every effort to find homes for these dogs, who are already housetrained, current on their shots, and have had their health checked by a veterinarian. Please visit the website and click on "Adopt a Senior Pet" to see photos of the dogs and to find out more. Phone: 800-459-3886. E-mail: [email protected]
I tried to connect to the site, but got a message saying unable to locate petfinder.org, so I am not sure what their status is. And of course he should inform them of the circumstances that caused her to bite (even if it was something like, I was watching TV and she walked over and bit my hand). Good luck.