It is best to schedule your dog's appointment so that you can monitor him for any side effects following administration of the vaccine. (laurelwoodvets.com)
As their immune systems are often still forming, administration of a vaccine holds greater potential to cause illness instead of preventing it. (patrickmahaney.com)
One administration of these vaccines needs to have been administered by a veterinarian, at or after the age of four months (16 weeks) and within the last year. (northbayhumanesociety.ca)