If you typed that question into your phone before your dog's next appointment, here's the short answer: every dog needs four core vaccines (rabies, distemper, adenovirus, and parvovirus), and most dogs in New Hampshire benefit from at least one or two lifestyle vaccines on top of that, depending on how they spend their days. The core vaccines protect against diseases that are common, hard to treat, and often fatal, so they apply to nearly every dog regardless of size or temperament. The lifestyle ones (think kennel cough, leptospirosis, Lyme disease) get added based on where your dog roams and who your dog meets. Allenstown Animal Hospital sees this question from new puppy owners and longtime dog owners alike, and the answer is almost always some version of "it depends on your dog's routine, but here's where we start."
The Four Vaccines No Dog Should Skip
Rabies, distemper, adenovirus, and parvovirus form the non-negotiable baseline for canine health. These four are grouped together because the diseases they prevent are widespread, brutal, and reliably stopped by vaccination. The only dogs who skip them are those with a documented medical reason, such as a severe past vaccine reaction or a serious illness at the time of vaccination, and your veterinary team will flag that if it applies.
Rabies isn't optional
Rabies kills once symptoms show up, in dogs and in the humans who care for them, which is why it's mandated by law across most of the country, New Hampshire included. Exact rules for first-dose timing and booster intervals can shift by state and sometimes by town, so your vet keeps the schedule aligned with what's legally required here.
DHPP: one shot, four diseases covered
Ask your vet about "DHPP" or "DAPP" and you're really asking about one combination injection that guards against distemper, hepatitis (from adenovirus), parainfluenza, and parvovirus.
Distemper hits the lungs, the digestive tract, and the nervous system all at once. Dogs who survive can be left with permanent tremors or seizures.
Adenovirus triggers infectious canine hepatitis, damaging the liver.
Parvovirus causes severe vomiting and bloody diarrhea, especially in young puppies, and it can linger in soil or on surfaces for over a year. A puppy doesn't need to meet a sick dog to get infected. Treatment requires days of hospitalization, and even then some puppies don't pull through.
Parainfluenza is a respiratory bug that contributes to kennel cough and rides along in the same shot.
Distemper and parvo used to fill veterinary waiting rooms across the country. Consistent vaccination is the reason that's no longer true, but both viruses are still out there, waiting for an unprotected dog.
Does My Dog Need Extra Vaccines Beyond the Core Four?
Possibly, and the answer hinges entirely on your dog's daily life, not on some universal checklist. Your vet will likely ask whether your dog boards, attends daycare, gets professionally groomed, hikes through the woods, or spends time near ponds and streams. New Hampshire's mix of dense forest, seasonal wildlife activity, and plenty of lakes and rivers means many local dogs qualify for more than just the basics.
Bordetella won't necessarily prevent kennel cough outright, but it blunts the severity if your dog does catch it. Any dog that boards, takes classes, visits a groomer, or plays in group settings should have it, and most facilities require proof before they'll accept your dog.
Leptospirosis spreads through soil or water contaminated by wildlife urine, and New Hampshire has no shortage of raccoons, deer, and rodents that can leave it behind in a backyard puddle or a favorite hiking trail. It can wreck the kidneys and liver, and it's transmissible to people, which is why many veterinarians now recommend it for nearly every dog, city apartment or country farmhouse alike.
Lyme disease comes from tick bites, and ticks are a real concern across the region, particularly from spring through fall when dogs are out in tall grass or wooded trails. Combine the vaccine with consistent tick prevention rather than relying on either alone.
Canine influenza spreads in clusters, often tied to boarding facilities, shows, or group events. Dogs with that kind of social calendar may need it.
One thing that trips people up: leptospirosis, Lyme, and canine influenza all require two doses spaced two to four weeks apart the first time around. Your dog isn't fully protected until after that second dose, so don't skip the follow-up visit just because the first one went smoothly.
Why Does My Puppy Need So Many Vaccine Visits?
Because a puppy's mother's milk contains antibodies that protect the puppy early on, but those same antibodies can also block vaccines from working. Nobody can predict exactly when that maternal protection fades for a given puppy. It might happen at 6 weeks, or it might hang on past 16 weeks. That unpredictability is the entire reason for repeat visits.
Vets start the puppy series at 6 to 8 weeks and repeat it every three to four weeks, wrapping up with a final dose between 16 and 20 weeks. Each visit is another shot at catching that narrow window after maternal antibodies fade but before real exposure happens. Skipping the final dose leaves a puppy vulnerable even though the owner might assume the job is done.
How Often Do Adult Dogs Need Boosters?
Most adult dogs get a booster around their first birthday, then the core DHPP combination every three years after that, since research shows protection holds up for at least that long in the majority of dogs. Rabies runs on its own timeline: the first rabies vaccine only lasts one year no matter what the label says, and only vaccines given after that initial dose qualify for a three-year cycle. Which cycle applies depends on the specific vaccine product and New Hampshire's requirements.
Lifestyle vaccines wear off faster. Bordetella, leptospirosis, and canine influenza typically need yearly boosters, and dogs with heavy social exposure, like frequent boarders, sometimes get bordetella every six months if a facility requests it.
Titer testing, a blood test measuring existing antibody levels, comes up occasionally as an alternative to automatic boosters. It can support stretching the interval for distemper and parvo in some dogs, and it's a reasonable thing to discuss with your veterinarian. It has real limits, though: no state will accept a titer instead of a legally required rabies vaccine, and titers aren't a reliable substitute for shorter-acting vaccines like leptospirosis or bordetella. A small number of states allow a documented medical exemption for dogs who truly cannot be vaccinated, but that's a separate conversation with your vet.
What Side Effects Should I Expect After a Vaccine?
Mild, brief symptoms are normal and don't mean anything went wrong. A dog with zero visible reaction is just as protected as one who seems a little off. For a day or two, expect possible tiredness, a lighter appetite, tenderness at the injection site, or a small firm bump that resolves over a couple of weeks. Dogs who get the intranasal kennel cough vaccine sometimes sneeze or cough lightly for a few days afterward. Keep the evening low key and let your dog rest.
When Should I Call the Vet After a Vaccine?
Serious allergic reactions are rare but urgent, and they typically show up within minutes to a few hours of the shot. Difficulty breathing, pale gums, sudden collapse, or extreme weakness means head straight to the nearest open veterinary hospital, calling ahead so the team is ready when you arrive. Don't wait on hold for a callback.
Call your vet's office right away, or an emergency clinic after hours, if you notice:
Swelling around the face, muzzle, or eyes
Hives or intense itching
Repeated vomiting or diarrhea
Less urgently, but still worth a call, is soreness or lethargy that lingers past 48 hours, or an injection site lump that keeps growing or hasn't gone away after three weeks. If your dog has ever had a reaction before, mention it before the next appointment so your vet can space vaccines across multiple visits and watch your dog for a while afterward.
What If a Booster Is Overdue?
Protection doesn't vanish the moment a due date passes, but it weakens, and the longer the gap, the less reliable it becomes. Depending on which vaccine and how overdue it is, your vet might give one catch-up dose or restart a full two-shot series.
A late rabies vaccine carries legal consequences beyond the medical ones. If a dog bites a person, most health departments require an observation period (usually 10 days) regardless of vaccination status. Wildlife encounters are where current vaccination really matters: a dog that's up to date on rabies and gets into it with a raccoon or bat generally just needs a booster and home observation, while an overdue or unvaccinated dog can face months of strict quarantine, and in some places officials may even consider euthanasia. Anyone bitten by a dog or wild animal should call a physician or local health department that same day, since post-exposure treatment for people works well but only if started before symptoms appear.
Boarding facilities, groomers, and daycares in and around Allenstown routinely turn away dogs with lapsed vaccine records, so staying current keeps more than just your dog's health on track.
Frequently Asked Questions
Can my dog get kennel cough even after the bordetella vaccine?
Yes, the bordetella vaccine reduces severity rather than guaranteeing your dog never catches it, so a vaccinated dog can still develop a mild cough after exposure.
Is leptospirosis really a risk for a dog that just walks around the neighborhood?
Yes, because rats and other rodents carry leptospirosis too, so even dogs who never leave a suburban yard or sidewalk can be exposed, which is why many vets now recommend the vaccine broadly.
My dog hates the vet. Can vaccines be spread across visits?
Yes, if your dog has had reactions before or gets especially anxious, your veterinarian can space out core and lifestyle vaccines across separate appointments rather than giving them all at once.
Does a three-year rabies vaccine mean my dog is covered for three years right away?
No, the first rabies vaccine your dog ever receives is only valid for one year even if the product label says three years; the three-year interval kicks in with later doses.
What's the actual risk of skipping the second lepto or Lyme shot?
Skipping the second dose means your dog isn't fully protected, since these vaccines require two doses two to four weeks apart the first time to build adequate immunity.
Every dog's ideal vaccine schedule looks a little different once you factor in age, health history, and how much time they spend outdoors around the ponds, trails, and backyards common throughout this part of New Hampshire. Allenstown Animal Hospital is a veterinary clinic in Allenstown that helps local dog owners sort out exactly which core and lifestyle vaccines fit their pet's routine, from puppy series scheduling to lifestyle risk assessments. If you're due for a booster, starting a puppy series, or just have questions after reading this, contact the Allenstown Animal Hospital team to schedule a visit and ask about vaccine planning alongside routine wellness exams and parasite prevention.
Book an Appointment or call us at (603) 485-7133.