Adult dogs with unknown vaccination history should also receive a single dose of killed rabies vaccine. (clearlakevetclinic.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)
They are typically rescues with unknown vaccination histories or have been bought from pet stores. (pets.webmd.com)