Puppy Vaccination Schedule: What Shots and When

Puppy vaccines can feel overwhelming — different shots, multiple visits, conflicting advice about timing. Here’s a straightforward breakdown of what your puppy actually needs, when, and why, so you can walk into those vet appointments knowing what’s going on.

The Two Categories: Core and Non-Core

Not every vaccine is required for every dog. Veterinarians divide them into two groups:

Core vaccines are recommended for all puppies regardless of lifestyle or location. These protect against diseases that are either widespread, highly contagious, or severe enough that the risk-benefit calculation is clear for every dog.

Non-core vaccines are given based on your dog’s individual exposure risk — where you live, whether they’ll be around other dogs, whether you board them, whether they swim in lakes or rivers. Your vet helps you figure out which ones apply.

The Core Puppy Schedule

6–8 Weeks: First DA2PP

The first vaccine your puppy typically gets is the DA2PP (also called DHPP or sometimes just “distemper combo”). It covers:

• Distemper — a serious viral disease affecting the respiratory, GI, and nervous systems
• Adenovirus (hepatitis) — causes liver disease
• Parvovirus — highly contagious, often fatal in unvaccinated puppies
• Parainfluenza — one cause of kennel cough

This shot gets repeated every 3–4 weeks because of how puppy immune systems work. When puppies are born, they receive maternal antibodies through their mother’s milk that provide temporary protection. The problem is that those antibodies also interfere with vaccines — they can neutralize the vaccine before the puppy’s immune system has a chance to respond. Giving multiple boosters ensures that at least one shot lands after the maternal antibodies have faded but before the puppy is left unprotected.

10–12 Weeks: DA2PP Booster

Same vaccine, second round. Some vets also add the Bordetella vaccine here if you plan to board your puppy, use doggy daycare, or enroll in group training classes. Most facilities require it.

Bordetella protects against the bacterial component of kennel cough. It comes as an intranasal spray, an oral liquid, or an injectable — the intranasal and oral versions tend to provide faster protection. If your puppy is going to be around other dogs soon, ask about this one proactively.

14–16 Weeks: DA2PP Booster + Rabies

The third DA2PP booster, and the rabies vaccine.

Rabies is legally required in most US states — not just recommended, required. The initial rabies shot is good for one year. After the one-year booster, most dogs move to a three-year schedule.

Some puppies experience mild soreness at the injection site and feel a bit tired for 24–48 hours after the 14–16 week visit because they’re getting multiple vaccines at once. This is normal. What’s not normal: facial swelling, vomiting, collapse, or difficulty breathing — these are rare allergic reactions that need immediate veterinary attention.

12–16 Months: Boosters

One year after the final puppy series, your dog gets booster shots to reinforce immunity. After this round, most core vaccines move to a three-year schedule (though some vets run titer tests to check immunity levels instead of automatically re-vaccinating).

The one-year visit is also when your vet will typically do a full physical exam, discuss heartworm prevention, and assess whether any non-core vaccines are appropriate for your dog’s lifestyle.

Non-Core Vaccines: A Quick Rundown

Leptospirosis — A bacterial disease spread through water and soil contaminated with infected animal urine. Dogs that hike, swim in natural water, or live in areas with lots of wildlife are at higher risk. It’s becoming more common in suburban and urban areas too. Many vets now recommend it as part of the routine schedule.

Lyme disease — Recommended in tick-heavy regions (Northeast, Upper Midwest, Pacific Northwest) or if your dog spends time in wooded areas. Given as a two-shot series initially, then annually.

Canine influenza — Two strains in the US (H3N2 and H3N8). Relevant mainly for dogs that have frequent contact with other dogs — boarding, daycare, dog parks, shows. Typically a two-shot initial series, then annual.

Bordetella — Listed as non-core technically, but realistically required by most boarding facilities and puppy classes. Worth getting even if your dog doesn’t board just to be safe.

What to Bring to Each Appointment

If your puppy came from a breeder or rescue, they almost certainly had their first vaccine already. Bring whatever records they gave you — this tells your vet exactly what was given and when, which affects the timing of subsequent boosters. Redoing a vaccine that was given too recently isn’t dangerous, but it’s unnecessary.

Also bring a fresh stool sample (a pea-sized amount in a zip-lock bag is fine). Most vets check for intestinal parasites at puppy visits, which is separate from the vaccination conversation but equally important.

The Socialization vs. Vaccination Timing Problem

This comes up constantly with new puppy owners: your puppy’s socialization window — the critical period when new experiences are most easily processed and least likely to cause lasting fear — runs roughly from 3 to 16 weeks. But puppies aren’t fully vaccinated until around 16 weeks.

You don’t have to choose between socialization and safety. The key is choosing lower-risk environments. Avoid dog parks and pet store floors where unvaccinated dogs may have been. Do carry your puppy in public, visit homes with vaccinated dogs, enroll in puppy classes that require proof of vaccination from all attendees, and let your puppy experience sounds, surfaces, and new people freely.

Missing socialization because you’re waiting for the full vaccine series is a trade-off that frequently backfires. Fear-based behavioral issues are harder to treat than a parvo infection is to prevent with reasonable precautions. Your vet can help you figure out what level of exposure is appropriate for your specific location and your puppy’s current vaccine status.

Our new puppy checklist has a section on scheduling that first vet visit — if you haven’t booked one yet, aim for within 48–72 hours of bringing your puppy home, even if they seem healthy.

After the Puppy Series: Annual vs. Three-Year

Once your dog completes the puppy series and the one-year boosters, talk to your vet about what makes sense going forward. Core vaccines like DA2PP have studies showing protection lasting three years or more, and many vets have moved to triennial (every three years) schedules. Rabies schedules are partly dictated by state law — your vet will know what applies where you live.

Some owners opt for titer testing — a blood test that measures existing antibody levels — rather than automatic re-vaccination. Titers can confirm that a dog still has adequate protection without an additional vaccine. Not every vet offers this, and it can cost more than the vaccine itself, but it’s a legitimate option if you prefer it.

Quick Reference Table

Age	Vaccines
6–8 weeks	DA2PP
10–12 weeks	DA2PP booster, Bordetella (if needed)
14–16 weeks	DA2PP booster, Rabies
12–16 months	DA2PP booster, Rabies booster
Every 1–3 years	Boosters per vet recommendation

One last thing: the schedule above is a general guide, not a rigid prescription. Your vet may adjust timing based on your puppy’s age at first visit, their background, your location, and their individual health. A puppy that arrives at 12 weeks instead of 8 weeks will have a somewhat compressed schedule. That’s fine — follow your vet’s specific recommendations over anything you read online, including this.

If you’re figuring out what your puppy eats while all this is happening, our puppy feeding guide covers portions and frequency by age.