Puppy Preventive Care Timeline: Vaccines, Deworming, Flea Tick, and Heartworm
- Most puppies start core vaccines at 6 to 8 weeks, then get boosters every 2 to 4 weeks until they are at least 16 weeks old.
- Routine deworming often begins at 2 weeks of age and repeats every 2 weeks until regular monthly parasite prevention starts.
- Heartworm prevention should start as early as the product label allows and no later than 8 weeks in most puppies, even before they are old enough to test positive.
- Flea and tick prevention timing depends on the product, your puppy's age, weight, and local parasite risk, so your vet should match the product to your puppy.
- A typical first-year preventive care budget for a puppy in the U.S. is about $450 to $1,200 for exams, vaccines, fecal testing, deworming, and parasite prevention.
Getting Started
Your puppy's first few months move fast. Preventive care helps protect them during the window when maternal antibodies are fading, their immune system is still developing, and parasites are common. That usually means a series of puppy visits for vaccines, fecal testing, deworming, and a plan for flea, tick, and heartworm prevention.
There is not one perfect schedule for every puppy. Your vet will tailor timing based on age, breed, size, lifestyle, travel, local parasite pressure, and whether your puppy came from a breeder, rescue, shelter, or unknown background. A puppy living in a low-risk apartment setting may need a different plan than one hiking, going to daycare, or living in a mosquito-heavy area.
In general, core vaccines begin around 6 to 8 weeks and continue every 2 to 4 weeks until at least 16 weeks of age. Deworming often starts earlier, because roundworms and hookworms are commonly passed from mother to puppies. Heartworm prevention is usually started by 8 weeks, and flea and tick products are started once your puppy meets the product's minimum age and weight.
The goal is steady, practical protection. If you are behind schedule, do not panic. Your vet can build a catch-up plan that fits your puppy and your budget.
Your New Pet Checklist
First vet visits
- ☐ Initial puppy exam within the first few days at home
Brings together a physical exam, timeline planning, and risk-based vaccine and parasite recommendations.
- ☐ 2 to 4 follow-up puppy wellness visits during the vaccine series
Some clinics bundle these into puppy plans.
- ☐ Weight checks before each preventive refill if needed
Helpful because puppies outgrow medication doses quickly.
Vaccines
- ☐ DA2PP/DHPP puppy series
Usually starts at 6 to 8 weeks and repeats every 2 to 4 weeks until at least 16 weeks.
- ☐ Rabies vaccine
Timing depends on state law and your vet's protocol, commonly around 12 to 16 weeks.
- ☐ Leptospirosis vaccine series
AAHA's 2024 update recommends lepto as core for all dogs.
- ☐ Bordetella vaccine
Often advised for daycare, boarding, grooming, training classes, or social puppies.
- ☐ Canine influenza or Lyme vaccine if risk-based
Depends on region and lifestyle.
Parasite screening and deworming
- ☐ Fecal parasite test
Often repeated 2 to 4 times in the first year depending on risk.
- ☐ Routine deworming treatments
Commonly repeated every 2 weeks in young puppies, then monthly prevention takes over.
- ☐ Giardia or coccidia testing/treatment if indicated
More likely in shelter, rescue, or diarrhea-prone puppies.
Monthly prevention
- ☐ Heartworm prevention
Year-round prevention is recommended in all dogs.
- ☐ Flea and tick prevention
Start when your puppy meets the product's age and weight label.
- ☐ Combination parasite preventive
May combine heartworm, fleas, ticks, roundworms, and hookworms in one product.
A practical puppy preventive care timeline
Birth to 8 weeks
Many puppies are dewormed by the breeder, rescue, or shelter before they go home. CAPC recommends routine deworming beginning at 2 weeks of age and repeating every 2 weeks until puppies are 4 to 8 weeks old and transitioned to a monthly product with parasite coverage. If your puppy's early history is unclear, tell your vet.
6 to 8 weeks
This is a common starting point for the first core vaccine visit. Puppies often receive DA2PP or DHPP at this age. Your vet may also recommend a fecal test, deworming, and starting heartworm prevention. Some flea and tick products can also begin around this age, but labels vary.
10 to 12 weeks
Many puppies receive the next DA2PP booster during this window. Leptospirosis may start as a 2-dose series depending on your vet's protocol, and Bordetella may be recommended if your puppy will attend training classes, daycare, boarding, or grooming.
14 to 16 weeks
Core vaccine boosters continue until your puppy is at least 16 weeks old. Rabies is often given around this age, depending on state law and clinic protocol. Some puppies also receive the second leptospirosis dose here.
6 to 12 months
Your puppy may need a booster visit around 1 year after the last puppy vaccines. Puppies started on heartworm prevention before 7 months usually do not need an initial test first, but the American Heartworm Society recommends testing 6 months after starting prevention, again 6 months later, and then yearly.
Which vaccines are core, and which are lifestyle-based?
Core puppy vaccines generally include distemper, adenovirus, and parvovirus, usually given together as DA2PP or DHPP. The AAHA canine vaccination guidelines, updated in 2024, also recommend leptospirosis as a core vaccine for all dogs. Rabies is also essential because it is required by law in most areas and protects both pets and people.
Lifestyle-based vaccines depend on exposure risk. Bordetella is commonly recommended for puppies that will be around other dogs. Canine influenza may be advised in some regions or social settings. Lyme vaccination may be considered in tick-heavy areas for puppies with outdoor exposure.
Your vet may adjust timing if your puppy started late, missed a booster, or has unknown vaccine history. The key point is that puppies need a series, not a single shot, because maternal antibodies can interfere with early vaccine response.
Why deworming matters so early
Roundworms and hookworms are common in puppies, even when they look healthy. Puppies can acquire roundworms before birth or through nursing, and hookworms can also pass from the mother. Merck and Cornell both note that young puppies are assumed to be at risk.
That is why routine deworming is often done on a schedule, not only when a fecal test is positive. A fecal exam is still important because it helps identify parasites such as giardia, coccidia, whipworms, or persistent roundworms and hookworms. CAPC recommends fecal testing multiple times in the first year.
Call your vet sooner if your puppy has diarrhea, a pot-bellied appearance, poor growth, vomiting, visible worms, pale gums, or low energy. Heavy parasite burdens can be more serious in very young puppies.
Flea, tick, and heartworm prevention basics
Heartworm prevention is one of the most important early decisions. The American Heartworm Society recommends starting puppies on prevention as early as the product label allows and no later than 8 weeks of age. Puppies under 7 months can usually start prevention without a heartworm test because it takes about 6 months after infection for a dog to test positive.
Flea and tick prevention is more individualized. Product labels differ by minimum age, weight, species, and parasite coverage. Some products cover fleas only, some cover fleas and ticks, and some combine flea, tick, heartworm, and intestinal parasite protection. Your vet will help you choose a product that fits your puppy's age, local tick risk, and household needs.
Do not use over-the-counter products casually, and never use a dog product on a cat. The EPA advises using only products labeled for the pet's species and age. If your puppy is very young, very small, or has a history of neurologic issues, ask your vet which options are the best fit.
When to be more cautious
See your vet immediately if your puppy is lethargic, not eating, vomiting repeatedly, has severe diarrhea, has blood in stool, pale gums, trouble breathing, facial swelling after a vaccine, or collapses. Mild soreness, sleepiness, or a small injection-site lump can happen after vaccines, but severe reactions are not normal.
Also call your vet if you miss more than one month of heartworm prevention, find attached ticks, notice fleas or flea dirt, or your puppy has ongoing diarrhea despite deworming. Preventive care works best when the plan is adjusted early rather than after a problem becomes bigger.
First-Year Cost Overview
Last updated: 2026-03
Questions to Ask Your Vet
Bring these questions to your vet appointment to get the most out of your visit.
- Which vaccines are core for my puppy, and which ones depend on lifestyle or local disease risk?
- What exact dates should my puppy come back for the rest of the vaccine series?
- Has my puppy already been dewormed, and do you recommend another routine deworming today?
- When should we run a fecal test again if today's sample is negative?
- Which flea, tick, and heartworm preventive fits my puppy's age, weight, breed, and local parasite risk?
- If I miss a monthly preventive dose, what should I do next?
- When is my puppy old enough for a heartworm test, and what testing schedule do you recommend after that?
- Are there wellness plans, vaccine clinics, or bundled options that could lower my first-year cost range?
Frequently Asked Questions
When do puppies start vaccines?
Most puppies start core vaccines at 6 to 8 weeks of age, then receive boosters every 2 to 4 weeks until they are at least 16 weeks old. Your vet may adjust the schedule if your puppy started late or has unknown history.
Do puppies need deworming even if they look healthy?
Often, yes. Puppies commonly carry roundworms or hookworms without obvious signs. That is why routine deworming is often recommended in young puppies, along with fecal testing.
When should heartworm prevention start in puppies?
The American Heartworm Society recommends starting heartworm prevention as early as the product label allows and no later than 8 weeks of age. Puppies under 7 months can usually start prevention without a heartworm test first.
When can my puppy start flea and tick prevention?
It depends on the product. Some can start around 6 to 8 weeks, while others require an older age or a minimum weight. Your vet should choose the product based on your puppy's size, age, and local parasite risk.
Is leptospirosis really needed for puppies?
In many cases, yes. AAHA's 2024 update recommends leptospirosis as a core vaccine for all dogs. Your vet can explain how that applies to your puppy and your area.
How much does first-year preventive care usually cost?
A practical first-year range is about $450 to $1,200 in the U.S. That usually includes exams, vaccines, fecal testing, deworming, and monthly parasite prevention. Costs vary by region, clinic type, and your puppy's size.