Keeping up with your dog’s vaccinations is one of the most straightforward things you can do for their long-term health — and one of the easiest to fall behind on. A booster that was due in March gets pushed to “next month,” next month becomes six months later, and suddenly your dog is overdue on three vaccines you can’t quite remember.
This guide covers everything you need to know about the 2026 dog vaccination schedule: which vaccines are required, which are optional based on your dog’s lifestyle, the full puppy timeline from 6 weeks to 16 months, and — just as importantly — how to actually keep track of due dates so you don’t have to rely on memory.
Core vaccines vs. optional vaccines: what’s the difference?
Not all vaccines are equal. Vets and the American Animal Hospital Association (AAHA) divide dog vaccines into two categories: core vaccines that every dog should receive regardless of lifestyle, and non-core (optional) vaccines recommended based on where your dog lives and how they spend their time.
| Vaccine | Type | What it protects against | Booster frequency |
|---|---|---|---|
| Rabies | Core | Rabies virus — fatal, transmissible to humans. Legally required in most US states. | Every 1 or 3 years (varies by product and local law) |
| Distemper, Adenovirus, Parvovirus (often in a DHPP combination) | Core | Core protection against distemper, adenovirus, and parvovirus. Some combinations also include parainfluenza, a lifestyle-based component. | Every 1–3 years after initial series |
| Bordetella (Kennel Cough) | Optional | Highly contagious respiratory infection. Required by most boarding, grooming, and doggy daycare facilities. | Every 6–12 months |
| Leptospirosis | Core (AAHA) | Bacterial infection from contaminated water or soil. AAHA recommends vaccination for all dogs, including urban dogs. | Annually |
| Lyme Disease | Optional | Tick-borne bacterial disease. Recommended in tick-heavy regions (Northeast, Midwest, Pacific Coast). | Annually |
| Canine Influenza | Optional | Dog flu — two strains (H3N2 and H3N8). Recommended for social dogs or those that travel. | Annually |
| Rattlesnake | Optional | AAHA does not provide a recommendation because evidence of clinical effectiveness is insufficient. A bite still requires emergency care. | Annually (before snake season) |
The puppy vaccination schedule (6 weeks to 16 months)
Puppies are born with some immunity passed from their mother, but it fades during the first few months of life. The puppy vaccine series is designed to build their own immune response during this vulnerable window. Timing matters — starting too late or spacing shots incorrectly can leave gaps in protection.
- 6–8 weeks: DHPP (first dose) — First combination vaccine. Often given by the breeder or rescue before you bring the puppy home. Ask for the certificate.
- 10–12 weeks: DHPP (second dose) + Bordetella (if boarding or socialization classes planned) + Leptospirosis: discuss starting the two-dose series at 12 weeks or older
- 14–16 weeks: DHPP (continue every 2–4 weeks until at least 16 weeks of age; your vet may extend to 20 weeks for higher risk) + Rabies (first dose) — Rabies is legally required in most states. This is typically the puppy’s first rabies shot. Plus Leptospirosis second dose 2–4 weeks after the first, as directed by your vet and Lyme first dose (if in a tick-endemic area)
- 12–16 months: DHPP booster + Rabies booster (switches to 1-year or 3-year product) + any non-core boosters due. This visit marks the transition from the puppy series to adult booster schedule.
Adult dog booster schedule
Once the puppy series is complete, the schedule simplifies considerably. Most core vaccines shift to every 1–3 years depending on the product and your state’s legal requirements. Non-core vaccines that apply to your dog typically run annually.
| Vaccine | Adult frequency | Notes |
|---|---|---|
| Rabies | Every 1 or 3 years | Depends on the product used and your state’s law. Your vet will tell you which applies. Keep the certificate — you’ll need it for boarding, travel, and licensing. |
| DHPP | Every 1–3 years | After the booster at 12–16 months, many vets switch to a 3-year DHPP product. Check what your vet is using. |
| Bordetella | Every 6–12 months | Most boarding and grooming facilities require proof within the last 6 months. Check before you book. |
| Leptospirosis | Annually | Annual booster required to maintain protection. Don’t skip it if your dog swims or hikes. |
| Lyme | Annually | Best given before tick season in your region (spring). Pair with year-round tick prevention. |
| Canine Influenza | Annually | If your dog attends doggy daycare, dog parks, or travels frequently, ask your vet about both H3N2 and H3N8 strains. |
Senior dogs: what changes after age 7
Older dogs don’t automatically need fewer vaccines, but the conversation with your vet does change. Some senior dogs with compromised immune systems or chronic illness may benefit from titre testing — a blood test that measures existing immunity — rather than automatic boosters.
- Rabies remains legally required regardless of age in most states
- DHPP — your vet may recommend titre testing before automatically reboosting a senior dog
- Non-core vaccines should still be given if your dog’s lifestyle warrants them — age alone does not eliminate exposure risk; leptospirosis is a core vaccine under AAHA guidance
- Senior wellness exams (twice yearly for dogs over 7) give your vet a chance to reassess the vaccine schedule based on your dog’s current health
What to do if you’ve lost your dog’s vaccine records
It happens more than you’d think. Moving house, switching vets, adopting a rescue with incomplete history — gaps in vaccine records are common. Here’s how to handle them:
- Call your previous vet and request a records transfer. Most clinics can email these within 24–48 hours.
- Contact the breeder or rescue if you have incomplete puppy records — they typically keep copies of the initial vaccines they gave.
- Titre testing can check for existing immunity to core diseases if the history is truly unknown — your vet can advise whether to test or simply restart the series.
- When in doubt, restart — repeating vaccines is generally safe and better than leaving a gap in protection.
How to track vaccine due dates without forgetting
The two most common reasons dogs fall behind on vaccines are: (1) the owner didn’t realize a booster was due, and (2) the reminder card from the vet got lost. Both are entirely preventable.
The most reliable system is to set a reminder the same day you leave the vet — not two weeks later when you remember, and definitely not when the booster is already overdue. A phone calendar reminder set for 30 days before the due date gives you time to book the appointment without rushing. If you have multiple pets, or multiple vaccines with different frequencies, this gets complicated fast. A running list of each vaccine, its last given date, and its next due date — all in one place — is genuinely useful. This is exactly what PetFolio Health tracks automatically: you enter the vaccine once, and it reminds you before the due date. No reminder cards to lose, no mental arithmetic about whether the 3-year DHPP is due this year or next.
Set vaccine reminders for every pet, automatically
PetFolio tracks vaccination history, sends reminders before due dates, and stores certificates you can pull up at the vet or boarding facility.
Get Started FreeFrequently asked questions
It depends on the product your vet uses and your state’s law. After the initial puppy shot, dogs typically receive a booster at 12–16 months, then switch to either a 1-year or 3-year product. Have your veterinarian confirm the legal interval for your location and the vaccine product; do not assume that every dog needs an annual dose.
Possibly — but check before you assume. Dog parks, grooming salons, training classes, and even some vet clinics require it. And Bordetella spreads through the air between dogs in close contact, so any social dog is at some risk. Talk to your vet about whether your dog’s lifestyle warrants it.
It depends on how overdue and which vaccine. For dogs that are slightly behind on non-core vaccines, your vet may simply restart the booster schedule. For core distemper, adenovirus, and parvovirus vaccines, a dog with a documented completed series does not necessarily need to restart; your veterinarian should determine the appropriate booster. Don’t put it off further — call your vet and let them assess. There’s no benefit to waiting.
Yes — at minimum the core vaccines. Rabies is legally required in most states regardless of whether your dog goes outside. Distemper and parvo can be carried in on shoes or clothing. “Indoor-only” is rarely as isolated as it sounds, and the vaccines are low-risk compared to the diseases they prevent.
Generally yes — it’s standard practice and most dogs handle combination vaccines well. Some dogs are sore or lethargic for a day or two after vaccines. Call your vet if signs are severe or don’t pass, or if you see swelling, hives, vomiting, or trouble breathing. If your dog has had reactions before, mention it to your vet before the appointment so they can plan accordingly.
Authoritative resources
Content updated by the PetFolio Health Editorial Team.
Turn the vaccination schedule into a verified record
AAHA updated its canine guidelines in 2024 to recommend leptospirosis vaccination as core for all dogs. A calendar is a planning aid; your veterinarian sets the schedule using age, documented prior doses, health, product instructions, and applicable rabies requirements.
- Bring the original certificates to your appointment, including records from previous clinics.
- Ask which vaccines are due now, which require another initial dose, and the exact return date.
- Record the product or vaccine name, administration date, clinic, and next due date from the clinic’s instructions.
- Keep the rabies certificate with the record; a reminder or a self-entered log does not replace it.
Check the AAHA vaccine recommendations with your veterinarian when planning care. This article is educational and has not been presented as a veterinary review.
Download a blank pet health record log
Download the pet health record log (CSV) and open it in Excel or Google Sheets. Use one row per event, keep source documents, and enter due dates only after the clinic confirms them. This log is an organizer, not a medical certificate.
Related guides
- How to Organize Pet Health Records: A Practical System
- Puppy Health Records: First-Week Setup Checklist
- French Bulldog Health Problems: What Owners Should Record
- Golden Retriever Health Issues: An Owner Tracking Guide
- Emergency Vet Visit Preparation: Records and Go-Bag
- How to Transfer Vet Records to a New Clinic
- What to Bring to a Vet Appointment: A Practical Checklist