Adult dogs with unknown vaccination history should also receive a single dose of killed rabies vaccine. (clearlakevetclinic.com)
They are typically rescues with unknown vaccination histories or have been bought from pet stores. (pets.webmd.com)
Therefore, it is advisable to keep even a vaccinated pup away from dogs or pups of unknown vaccination history until it has finished its vaccination course. (springcreekanimalhospital.com)