New Dog Parasite Prevention Schedule: The First 90 Days and the First-Year Cost

A new dog parasite prevention schedule has three parts: a fecal test in the first few days, a heartworm test before monthly prevention starts, and a flea and tick product matched to age and weight. At 2024-2026 US price ranges, those first 90 days cost about $173 to $475. This guide lays out what is due and when, plus a month-by-month cost ledger for the first year.

Photo: Ignacio Andres Yañez Grandon / Pexels

A composite example: day one with a newly adopted dog

This is a composite scenario, not a real owner's account. It shows the gap many new adopters face when nobody hands them a medication list.

An owner brings home a 12-week-old mixed-breed puppy from a rescue. The paperwork lists vaccines and a spay date. It says nothing about worms, heartworm or ticks. At the pet store the owner stands in front of a wall of flea products and cannot tell what is a medicine and what is a marketing claim.

The fix is not a shopping trip. It is a phone call to book a first vet visit, with a stool sample in a sealed bag. Everything else in the plan follows from what that visit finds.

The rest of this guide is the checklist that owner needed on day one.

New dog parasite prevention schedule: days 1 to 90

The first 90 days follow a simple order: test, treat, then prevent monthly. Testing comes first because the results decide which products are safe and useful.

When	What to do	Typical cost
Days 1-3	First vet visit with a stool sample; fecal test and dewormer	$60-$120 for the fecal test and dewormer
Days 1-14	Heartworm test as your vet advises; start monthly heartworm prevention	$35-$100 test, then $6-$25 a month
Days 1-14	Start an age- and weight-appropriate flea and tick product	$5-$30 a month
Day 30	Second monthly dose of each product	$11-$55
Day 60	Third monthly dose of each product	$11-$55
About day 90	Second fecal test; ask your vet about retesting for heartworm	$45-$90

Summed across the 90 days, the low case is about $173 and the high case about $475. The next sections explain each line and where the prices come from.

Two cautions apply to every step. Never give an adult dose to a young puppy, because products have minimum ages and weights. And never use a cat product on a dog or a dog product on a cat.

Intestinal worms: the fecal tests that cost the most

Intestinal worms are the first parasite to deal with, and they drive the largest cost in year one. The Companion Animal Parasite Council's roundworm guideline recommends at least four fecal tests in a puppy's first year of life and at least two a year for adults.

Why so many tests? The same guideline reports that "virtually all pups are born infected" with the roundworm Toxocara canis. It also says more than 30% of dogs younger than 6 months are shedding its eggs. A puppy can look healthy while carrying worms.

CAPC's puppy schedule starts early. It calls for dewormers at 2 weeks of age, repeated every 2 weeks until the puppy is 4 to 8 weeks old, then a monthly product that covers roundworms. A breeder or rescue handles that stage. Ask for the dates and products in writing so your vet can pick up where they left off.

Roundworms also affect people. CAPC describes Toxocara as a well-documented zoonotic agent, with eggs commonly found in soil at playgrounds and parks that stay infective for many years. Children who eat dirt are most at risk. Picking up stool promptly cuts the exposure.

Petfolk's vet checkup cost guide puts a fecal test at $45 to $90. Our first vet visit cost guide shows lower figures at full-service clinics, so price-check your own area. A dewormer adds roughly $15 to $30 per dose.

Heartworm: test first, then prevent year-round

Heartworm prevention starts with a test and then continues every month of the year. CAPC's heartworm guideline says all dogs should be on year-round prevention and tested annually, including dogs already on prevention. In some regions twice-yearly testing may be advised.

The disease is not limited to warm states. The same guideline reports that dogs and cats are susceptible to heartworm in all 50 states. Cases cluster in the Southeast and the Mississippi River Valley.

Timing matters for young dogs. The American Heartworm Society says larvae take about 6 months to become adult worms, as covered in our heartworm cost guide. That is why a test on a young puppy can look clean while larvae are still developing. Ask your vet when to retest.

Prices run in these ranges:

• Heartworm test: $35 to $75 per PetMD, updated April 2025, and $45 to $100 per Petfolk. CareCredit's average is $71.
• Prevention: $6 to $18 a month per PetMD, or $14 a month on average per CareCredit, with a range of $11 to $25.
• Treatment if infected: $1,200 to $1,800 for a 40-pound dog, per the American Heartworm Society figure cited by CareCredit.

The gap between a $14 monthly chewable and an $1,800 treatment course is the reason this line is never optional.

Fleas and ticks: what a puppy can start and when

Flea and tick products must match a puppy's age and weight, so your vet should choose the first one. Labels set the limits. NexGard and Bravecto's 1-Month chewable are labeled from 8 weeks and 4 pounds, while standard Bravecto and standard Simparica require dogs to be at least 6 months old, as detailed in our flea and tick prevention cost guide.

That guide puts monthly cost at $5 to $30 depending on product type. Collars cost less per month but have their own age limits, so ask before buying.

Tick risk is growing. The CAPC 2026 parasite forecast, released March 23, 2026, projects Lyme-carrying ticks expanding across states including Ohio, Kentucky, Tennessee, Indiana, Illinois and Michigan. Brown dog ticks can live indoors, so a cold winter does not end the risk in many areas.

Stay with products reviewed by the FDA or EPA. Our guide on natural flea and tick remedies for dogs covers why "natural" labels carry a documented poisoning risk.

Puppy flea tick heartworm prevention cost: the first-year ledger

Puppy flea tick heartworm prevention cost lands near $742 in the first year at midpoint prices, with a full range of $362 to $1,150. The ledger below combines every parasite line in one place.

Line item	Low	Midpoint	High	Basis
Fecal tests (4)	$180	$270	$360	$45-$90 each, per Petfolk, times CAPC's four
Dewormer (1 course)	$15	$23	$30	$15-$30, per our first-visit guide
Heartworm test (1)	$35	$71	$100	PetMD, CareCredit, Petfolk
Heartworm prevention (12 months)	$72	$168	$300	$6-$25 a month
Flea and tick (12 months)	$60	$210	$360	$5-$30 a month
Total	$362	$742	$1,150

The midpoint column uses CareCredit's $71 test and $14 monthly heartworm average. For fecal tests and flea-tick products it uses the middle of the quoted range, which is a PetBudget assumption, not a sourced average. Vaccines, exams, spay or neuter surgery and food are not included.

Two lessons come out of the table. First, fecal tests are the largest line. Four tests at $67.50 cost more than a full year of flea and tick prevention at the midpoint. Many new-dog budgets leave them out entirely.

Second, the range is wide. High-cost metros, combination products and clinic markups push a dog toward $1,150, while low-cost clinics and generic products pull it toward $362.

What medications does a new dog need? The short list

What medications does a new dog need? Three, in most cases, chosen by your vet from the test results.

1. A dewormer for intestinal worms. It treats what the fecal test finds, then a monthly product keeps roundworms in check.
2. A monthly heartworm preventive. It is given year-round, and a test comes first.
3. A flea and tick product. It must match your dog's age and weight.

Many combination chewables cover more than one of these in a single dose. A combination can lower the monthly cost or raise it, depending on the brand. Ask your vet to price both a combination and separate products for your dog's size.

Everything else a new dog gets, such as core vaccines and a rabies shot, is a different budget line. See the vaccine cost guide for those prices.

What the schedule costs if you skip it

Skipping the schedule moves cost from predictable to unpredictable. The $742 midpoint is spread over twelve months and fits a monthly budget. The alternatives are not.

Skipped step	Possible bill	Source
Heartworm prevention and testing	$1,200-$1,800 for a 40-pound dog	American Heartworm Society, via CareCredit
Tick prevention	$700-$8,000 for Lyme disease in reader-reported bills	CostHelper, via our flea guide
Home flea infestation	$75-$400 for professional treatment	Angi, via our flea guide

None of these include the harm to your dog, which money does not repair. A single heartworm treatment course costs as much as 7 to 11 years of prevention at the $14 monthly average, before counting yearly tests.

Ways to keep the schedule affordable

You can lower parasite costs without dropping a step. Start with these:

• Ask the rescue what is already done. Some include dewormers, fecal tests or a prevention starter pack in the adoption fee. See our adoption cost guide.
• Ask for a written prescription. Then compare pharmacy prices for the monthly products.
• Price a wellness plan. Some bundle testing and prevention into one monthly fee. The wellness plans versus pet insurance comparison shows when the math works.
• Spread payments, not doses. If the first visit strains your budget, a payment plan is safer than skipping a test. See vets that take payment plans.
• Schedule fecal tests with visits you already have. That saves exam fees on a separate trip.

Budgeting the schedule

Add $362 to $1,150 to your new dog's first-year budget, and plan for a smaller recurring line after that. In later years you no longer need four fecal tests, which drops the cost toward the heartworm test, two fecal tests, and monthly products. The earlier heartworm cost guide shows the adult-dog math.

For a figure that fits your dog, run your breed, size and metro area through the pet cost calculator. To see how this fits with food, vaccines and surgery, read the first-year pet cost ledger and the new puppy checklist. If an unplanned bill worries you, size a cushion with the emergency fund calculator.

This article is general information, not veterinary advice. Ask your vet which tests and products fit your dog's age, weight and region.