Supporting character in the Lord of the Rings trilogy. Gandalf is a wizard who dies in the first book but comes back in The 2 Towers. He helps Frodo, a hobbit, bring the one ring to Mordor, where it can be destroyed to save Middle Earth. Gandalf is to Mage as Frodo is to Hobbit.
Puppies vaccinated for distemper once at 12 to 16 weeks of age with a high titer vaccine have a virtually 100% chance of being protected. And that protection is most likely for life.
Generally young, unvaccinated or not fully-vaccinated puppies, under 6 months of age, are most susceptible to canine distemper virus. Very young puppies (under 3 months old) that did not receive their mother's colostrum (maternal immunity) are also at high risk.