Vaccination helps protect dogs against serious infectious diseases and contributes to wider animal and public health. A dog does not become automatically immune simply by reaching adulthood. Puppies and adult dogs both need a plan based on documented vaccination history, health, likely exposure and local requirements.
Why puppies receive a course
Antibodies received from the mother can provide early protection, but their levels vary and may interfere with vaccination. Repeated doses help cover the period as that maternal protection declines. One early injection is not a reliable substitute for a properly completed course.
The WSAVA vaccination guidelines recommend starting the usual core puppy series at around six to eight weeks and repeating doses every two to four weeks until at least sixteen weeks of age. Higher-risk situations may call for a later final dose. Your veterinarian should set the exact schedule for the products used and local conditions; a course ending at twelve weeks may leave a gap in protection.
Which diseases are covered?
Core protection includes canine distemper, adenovirus and parvovirus. Rabies vaccination is essential where the disease occurs and must also follow applicable legal requirements. Leptospirosis recommendations depend on regional guidance, suitable vaccines and disease risk.
AAHA's canine vaccination guidance, updated in 2024, recommends leptospirosis vaccination as core for all dogs in its guidance. Other vaccines, such as those for Bordetella, canine influenza or Lyme disease, may be recommended according to location and exposure. Boarding, daycare, travel and contact with other dogs can affect the plan. A vaccine name or combination product should be explained clearly in the dog's record.
Adults need an individual booster plan
Not every vaccine must be repeated annually, and different products have different revaccination intervals. Some protection is maintained on a multi-year schedule after the initial series and booster, while other vaccines need more frequent doses. Rabies timing also depends on the licensed product and local law.
Bring all available records when adopting a dog or changing clinics. If the history is uncertain or doses are overdue, let the veterinarian design a catch-up plan. Do not assume that an adult rescue has protection simply because it appears healthy. Annual health visits remain useful even when a particular vaccine is not due.
Prepare for the appointment
Tell the veterinary team about current illness, medications and any previous vaccine reaction. Arrange vaccination through a veterinary practice so that product selection, storage, examination and records are properly managed. Keep a copy of the vaccine names, dates and next recommended appointments.
VCA's vaccine overview explains that mild tiredness or local soreness can occur afterward. Contact the clinic about worrying or persistent signs. Facial swelling, difficulty breathing or collapse require urgent veterinary care.
Vaccination reduces risk but does not replace hygiene, parasite prevention or sensible introductions. Ask how to provide safe early social experiences while the puppy course is underway, using suitable environments and healthy, appropriately vaccinated companions rather than unrestricted exposure in busy dog areas.
