I inquired to Cheryl about some more info on Buster and she replied:

Buster was still a puppy when he was hit..
less than a year. Betsy found him last October.
So I would say he is maybe a little over a year.

No one ever claimed him...there were posters
and ads in the paper. I'm sure Betsy would have
loved to have had help with the surgery costs.
Buster is part of her household and joins two
other dogs and a cat. Betsy said her vet told
her Buster was probably purebred.