
Hi Christine
litters aren't registered per area - only per breed. There are dogs of my breed rehomed in areas at the opposite end of the country from where they originated, some through breeders themselves, breed rescue and others general rescues (lost/strayed/stolen/who knows :( )
If still in contact with your breeder perhaps you could let him/her know as were this one of theirs I'm sure they'd want to know it's new owners details. Failing that if you have the date of birth and registration papers for your own dog, perhaps you could contact the breed club and let them know you believe one of his littermates
may have been rehomed near you. That way, they may be able to alert a breeder re this dog and possibly assist in establishing a connection with the new owner :)
HTH, Teri