Aids in preventing kennel cough caused by Bordetella bronchiseptica. Vanguard® B (IN) contains an avirulent live culture of Bordetella bronchiseptica (Bb) for intranasal (IN) vaccination of healthy dogs and puppies at least 3 weeks of age or older as an aid in preventing kennel cough (canine infectious tracheobronchitis) caused by B. bronchiseptica.