Adenovirus, type 1 (CAV-1, canine hepatitis)
Depends on vaccine. For instance, the intranasal one just has to be boostered once a year
Depends on vaccine
Puppies need a booster 1 year after completing the initial series, then all dogs need a booster every 3 years or more often.
Core dog vaccine. Spread via infected saliva, urine and feces; canine hepatitis can lead to severe liver damage, and death.