Vaccination is the single most effective preventive health measure in veterinary medicine. Core vaccines prevent diseases that are universally fatal or nearly so (rabies, distemper, parvovirus). Yet vaccination has also become controversial, with some owners fearing over-vaccination and others skipping vaccines entirely. This guide provides the evidence-based vaccination protocol recommended by the American Animal Hospital Association (AAHA).
Core Vaccines (Required for All Dogs)
| Vaccine | Disease | Why Core | Mortality Without Treatment |
|---|---|---|---|
| Rabies | Rabies virus | Fatal, zoonotic (transmissible to humans), legally required | 100% |
| Distemper (CDV) | Canine distemper virus | Highly contagious, multi-system disease, often fatal | 50-80% |
| Parvovirus (CPV) | Canine parvovirus | Extremely contagious, severe GI disease, high puppy mortality | 90% untreated; 10-20% with treatment |
| Adenovirus-2 (CAV-2) | Infectious hepatitis | Liver failure, hemorrhage | 10-30% |
Non-Core Vaccines (Based on Risk/Lifestyle)
| Vaccine | Recommended For | Transmission |
|---|---|---|
| Bordetella (Kennel Cough) | Dogs in boarding, daycare, grooming, dog parks | Respiratory droplets |
| Leptospirosis | Dogs in areas with wildlife, standing water, flooded areas | Contaminated water/urine |
| Canine Influenza (H3N2/H3N8) | Dogs in high-density environments (daycare, shows) | Respiratory droplets |
| Lyme Disease | Dogs in tick-endemic areas (Northeast, Upper Midwest) | Tick bite (Ixodes) |
| Rattlesnake | Dogs in rattlesnake territory | Envenomation |
Puppy Vaccination Schedule
| Age | Vaccines |
|---|---|
| 6-8 weeks | DA2PP #1 (Distemper, Adenovirus, Parainfluenza, Parvovirus) |
| 10-12 weeks | DA2PP #2; Leptospirosis #1; Bordetella (if needed) |
| 14-16 weeks | DA2PP #3; Leptospirosis #2; Rabies (first dose) |
| 12-16 months | DA2PP booster; Rabies booster; Lepto booster |
Adult Vaccination Schedule
- Rabies: Every 3 years (after initial 1-year booster) — legally required
- DA2PP: Every 3 years (AAHA 2022 guidelines)
- Leptospirosis: Annually (immunity wanes within 12 months)
- Bordetella: Annually or every 6 months for high-exposure dogs
- Canine Influenza: Annually if at risk
- Lyme: Annually if in endemic area
Titer Testing
Titer testing measures antibody levels to determine if a dog still has protective immunity from previous vaccination. It's a valid alternative to automatic re-vaccination for core vaccines (distemper, parvovirus, adenovirus):
- Pros: Avoids unnecessary vaccination; confirms protection; useful for dogs with vaccine reactions
- Cons: More expensive than vaccine ($150-$300 vs. $25-$50); doesn't replace rabies vaccine (legally required regardless of titer)
- Note: A positive titer confirms protection. A negative titer means revaccination is needed.
Frequently Asked Questions
Can vaccines cause problems?
Mild reactions (lethargy, mild fever, injection site tenderness) are common and self-resolving within 24-48 hours. Serious reactions (anaphylaxis, immune-mediated disease) are rare — roughly 1 in 10,000 to 1 in 100,000 doses. The risk of vaccine-preventable disease far exceeds vaccine risk for the vast majority of dogs.
Is my indoor dog safe without vaccines?
No dog is truly "zero risk." Rabies is legally required everywhere. Parvovirus survives in the environment for months-years and can be tracked indoors on shoes. Even indoor dogs should receive core vaccines.
