Does this sound familiar? Distemper is the most important vaccine your pet will need. It included Distemper (Respiratory & Neurologic,) Adenovirus 1 (Hepatitis,) Adenovirus 2 (Respiratory Disease,) Parainfluenza (Respiratory,) Canine Parvovirus (Gastrointestinal.) The reason it's done in a series of 4 visits, initially, is to build their immunity and protects them from harmful diseases they can contract from other un-vaccinated dogs. Once your puppy is fully vaccinated, they can go to dog parks, day care and other fun places to meet new friends. After 1 year, the distemper vaccine is available every 3 years! Isn't that great!