My Puppy's Roadmap
Puppy vaccine schedule by age: your puppy's first-year roadmap
By Dr. Steve Pelton, DVM, a vet since 2000.
Every puppy's first year has the same big stops: a run of shot visits, worms and prevention, a socialization window that closes fast, a mouthful of new teeth, a teenage phase and a birthday. What changes is the dates. Put in yours and you'll see when each one lands.
Free tool
My Puppy's Roadmap
Type your puppy's birthday and watch the whole first year lay itself out: shot visits, parasite checks, teething, the teenage phase and the big first birthday, all with real dates. Then add them to your calendar or print a copy for your vet.
Your puppy's timeline shows up here as soon as you pick a birth date.
General education, not veterinary advice. Your vet's plan for your puppy comes first.
How the dates are worked out
The shot visits follow the American Animal Hospital Association (AAHA) guidelines: a combination shot every 3 to 4 weeks until your puppy is past 16 weeks, because nobody knows the exact week a mother's antibodies stop blocking the vaccine. A puppy who comes home after 16 weeks gets a short catch-up series instead. Rabies timing is set by state law; in Texas it's by 16 weeks.
Your vet may space things differently for your puppy, your area and the shots your puppy already had. That's normal, and their plan comes first. Bring this along and use it to ask good questions.
Wondering about getting out before the shots are done? Here's how to do it safely.
Questions I get every day
How often does a puppy need shots, and when is the last one?
Most puppies get a combination shot for distemper and parvo every 3 to 4 weeks, starting around 8 weeks old. The series keeps going until your puppy is past 16 weeks, and that last shot is the one that matters most. Rabies usually goes in between 12 and 16 weeks. In Texas it's due by 16 weeks, and other states set their own rules. Your vet may adjust the plan for your puppy and your area.
Why does my puppy need a series of shots instead of just one?
Because the antibodies your puppy got from his mother can block a vaccine, and nobody knows the exact week they fade. It varies from puppy to puppy, even within a litter. So vets give a shot every few weeks, and each one is another chance to catch the moment that borrowed protection drops. By the shot after 16 weeks, it's gone in almost every puppy.
Does my puppy need the lepto vaccine?
Ask your vet. AAHA added leptospirosis to its core list in 2024, and plenty of good vets give it to every dog. I decide by lifestyle, breed, size and where the dog lives: a big dog who swims in ponds or hikes is a good candidate, and many small dogs who live mostly indoors skip it. If your puppy gets it, it's two shots 2 to 4 weeks apart, starting at 12 weeks or later.
When does my puppy need a heartworm test?
Not to start prevention. Heartworm prevention starts at the first puppy visit, no test needed. The test looks for adult worms, which take months to grow, so for a puppy who's been on prevention since the start, the first test comes after 7 months of age, then once a year. If prevention started late or there were gaps, your vet may test sooner.
My puppy came home at 5 months with almost no records. Does he start over?
Not with the whole puppy series. Past 16 weeks, a mother's antibodies are almost always gone, so the vaccine works right away. AAHA calls for two combination shots, 2 to 4 weeks apart, plus rabies on your state's schedule if there's no record of one. If the records are unclear, your vet may treat them as unknown and start fresh, or talk with you about a titer test.
When should I spay or neuter my puppy?
It depends mostly on adult size. AAHA's guideline for dogs under about 45 pounds grown is around 5 to 6 months, before a female's first heat. For bigger dogs, males usually wait until they're done growing, around 9 to 15 months. Big females are the hardest call, anywhere from 5 to 15 months, and that one's a real conversation with your vet about the trade-offs.
Where this comes from
- American Animal Hospital Association (AAHA). 2022 Canine Vaccination Guidelines, 2024 update.
- AAHA. 2019 Canine Life Stage Guidelines (spay and neuter timing by projected adult weight).
- American Heartworm Society. Canine heartworm guidelines (prevention by 8 weeks; testing from 7 months).
- Companion Animal Parasite Council (CAPC). Deworming and parasite control guidelines.
- Herron M, Stull J. Balancing puppy socialization with infectious disease prevention. The Ohio State University.
- American Veterinary Society of Animal Behavior (AVSAB). Position Statement on Puppy Socialization. 2008.
- Texas Administrative Code, 25 TAC 169.29 (rabies vaccination by 16 weeks of age).