Dog Vaccination Schedule

Canine Immunology, Maternal Antibody Half-Life, and AAHA Core Protocols

Vaccination is the most effective preventative medicine intervention in veterinary history, protecting domestic canines against fatal viral and bacterial pathogens. Under clinical guidelines established by the American Animal Hospital Association (AAHA) Canine Vaccine Task Force and the AVMA, vaccines are classified into Core (mandatory for all dogs) and Non-Core (lifestyle and geographically dependent).

AAHA Canine Vaccination Roadmap:
1. Core Vaccines (Mandatory for ALL Dogs):
   - DAPP / DHPP (Distemper, Adenovirus-2 [Hepatitis], Parvovirus, Parainfluenza):
     Initial series every 3–4 weeks starting at 6–8 weeks until 16–20 weeks of age; boosted at 1 year, then every 3 years
   - Rabies: Required by law; administered at 12–16 weeks; boosted at 1 year, then every 3 years
2. Non-Core / Lifestyle Vaccines:
   - Leptospirosis (4-Way): Mandatory for dogs exposed to wildlife, puddles, and suburban yards; series of 2 shots, then annual boosters
   - Bordetella bronchiseptica & Bivalent Canine Influenza (H3N2/H3N8): Required for boarding, daycare, grooming, and dog parks
   - Borrelia burgdorferi (Lyme): For dogs in tick-endemic regions (Northeast/Midwest)

Maternal Antibody Interference (The Window of Vulnerability)

Newborn puppies absorb protective maternal antibodies (immunoglobulins / IgG) from colostrum during their first 24 hours of life:

• These maternal antibodies circulate for 6 to 16 weeks, neutralizing wild viruses.
• However, maternal antibodies also neutralize vaccine antigens before the puppy's immune system can respond.
• Because the exact week maternal antibodies decline varies in every puppy, boosters must be administered every 3 to 4 weeks until 16 to 20 weeks of age to guarantee active immunization.

Track emergency clinic access with Emergency Vet Finder, plan adoption steps via Dog Adoption Checklist, calculate visit costs with Pet Vet Visit Cost Estimator, and explore vaccine research at AAHA.