Flea, tick and heartworm prevention schedule: what the guidelines recommend

Vaccines get most of the attention at the vet's office, but parasites cause just as much trouble: fleas that move into the carpet, ticks that hitch a ride home from a walk, and heartworm, which is spread by mosquitoes. Prevention is far easier than treatment, but it is also a schedule, and schedules are easy to lose track of. This guide explains what the Companion Animal Parasite Council (CAPC) and the American Heartworm Society (AHS) recommend, in plain language, and shows a simple way to keep it organised. It is general information; your veterinarian chooses the products and the timing for your pet, because risk varies by region, age and lifestyle.

The core recommendation: year-round, broad-spectrum

CAPC's general guidelines for dogs and cats are clear on the main point. They recommend year-round broad-spectrum parasite control with efficacy against heartworm, intestinal parasites, fleas and ticks. They also say that controlling parasites with zoonotic potential, meaning those that can pass to people, is essential. That second point matters for households with children, older relatives or anyone with a weak immune system.

"Year-round" is the part many owners find surprising. A lot of us start the flea and tick product in spring and stop in autumn. The AHS notes that many dogs receive heartworm medication only in spring, summer and autumn, which leaves room for infection because weather is unpredictable and mosquitoes can survive indoors in protected areas. CAPC's guidance also covers the case where year-round control is not possible: it recommends routine, year-round use of heartworm preventive in all pets and flea and tick control in all pets, as a minimum.

What this means in practice: ask your vet whether a year-round plan makes sense where you live, and do not stop the products just because the first frost has arrived. Your vet knows the local picture and may have a good reason to adjust.

A schedule at a glance

Everything in this table is a framework to discuss, not instructions to follow on your own. Your vet will tell you which product, how often, and from what age.

Heartworm: test, then prevent

Heartworm is spread by mosquitoes that carry heartworm larvae, according to the AHS. It is preventable, and it can be treated in dogs, but the AHS says early detection is essential. That is why testing is part of the schedule, not an optional extra.

Dogs

CAPC recommends annual heartworm testing in dogs, and the AHS recommends yearly testing for all dogs. The test is a simple blood test that a vet can run during an annual or semiannual wellness visit. A negative result means your dog has been protected for another year. The AHS also gives a useful reason to keep testing even when you give the preventive faithfully: a dog that vomits or spits out a pill, or a topical product that is not fully absorbed, may be less protected than you think. Testing is the safeguard against those gaps. The AHS adds that leftover medication when your vet reminds you to refill is a sign you missed a dose or two, which is a good prompt to be honest at the visit.

Cats

For cats, CAPC says to test before placing a cat on a heartworm preventive, and thereafter as indicated. The rest is for your vet: how often to retest, which preventive, and how much the risk is for a cat that never goes out. Do not assume an indoor cat is safe without asking; the AHS notes that mosquitoes can survive indoors.

Fleas and ticks

CAPC's year-round recommendation includes fleas and ticks. Beyond the product itself, a few habits help.

• Check after time outdoors. The CDC notes that ticks can ride into the home on clothing and pets and attach to a person later, and recommends carefully examining pets, along with coats and daypacks, after time outdoors. A quick hands-over-the-body check after walks in long grass or woods is a good routine.
• Test for tick-borne disease. CAPC recommends testing annually for tick-transmitted pathogens, especially in regions where they are endemic or emerging. Your vet may combine this with the heartworm test.
• Treat the household as a whole. If one pet has fleas, ask your vet about the other pets and the home. This guide does not give specific protocols, because they depend on the products and your vet's advice.

Never use a dog flea or tick product on a cat, or the other way round, unless your vet says so. Products made for one species can be dangerous to the other, and that is something to confirm with your vet or an animal poison control service if you have any doubt.

Intestinal parasites: fecal tests and deworming

CAPC recommends fecal examinations at least four times during the first year of life, and at least twice a year for healthy adults, with the frequency adjusted for health, environment and lifestyle such as travel or outdoor access. It also says that passive fecal flotation is not recommended, which is a technical point for your vet, not a thing you need to do at home.

For young animals, CAPC recommends that deworming start at 2 weeks of age and repeat every 2 weeks until regular broad-spectrum control begins, where year-round control is in place. Puppies and kittens adopted from a shelter or breeder may already have had their first doses, so ask for the paperwork and add it to the pet's record.

Where year-round control is not possible, CAPC's alternative is: repeat every 2 weeks until 2 months of age, monthly until 6 months, then quarterly, and treat adult pets four times a year, with fecal testing at least two to four times a year. That is a fallback, not the goal.

How to keep the schedule organised

Parasite prevention goes wrong in boring ways: a dose is a week late, a refill is forgotten, or nobody remembers when the last heartworm test was. A simple system covers most of it.

1. Write down the product and the interval. Ask your vet for the name of each product, how it is given and how often. Put the name, the next due date and the date of purchase in one place.
2. Use recurring reminders. A reminder that repeats at the interval your vet gave you beats a calendar note you have to remember to create again. In Pawfolio you can set a medication reminder with Given and Snooze buttons, so tapping Given records that the dose was done.
3. Put the yearly checks on the calendar once. Heartworm test, tick-borne disease test, fecal exams: schedule them with the annual visit and note the results. See what to keep in a pet health record.
4. Record the missed ones. If a dose is late or missed, write down the date and tell the vet at the next visit. The AHS makes the point that testing exists to catch gaps, so it helps if the vet knows where the gaps might be.
5. Watch the supply. Count what is left when you give a dose, and reorder before you run out. The medication reminder guide has a simple run-out method.

If you have more than one pet, give each its own list. Dogs and cats may take different products on different days, and it is easy to give a dose to the wrong animal or to believe it was done when it was not.

Questions to take to your vet

• Is year-round prevention right for where we live, and for my pet's lifestyle?
• Which product covers which parasites, and what is the interval?
• When was the last heartworm test, and when is the next one?
• Does my pet need a tick-borne disease test?
• How often should we check for intestinal parasites?
• What should I do if I miss a dose, or my pet vomits after it?

This guide and Pawfolio do not replace veterinary care. Parasite risk and the right products depend on your pet and where you live.

Frequently asked questions

Should I give flea, tick and heartworm prevention all year?

CAPC recommends year-round broad-spectrum parasite control with efficacy against heartworm, intestinal parasites, fleas and ticks. The American Heartworm Society also recommends year-round heartworm prevention. Ask your vet about your area.

How often should a dog be tested for heartworm?

CAPC and the American Heartworm Society both recommend annual heartworm testing for dogs. It is a simple blood test, often done at the yearly wellness visit.

Do cats need heartworm testing?

CAPC says to test cats before starting a heartworm preventive, and afterwards as indicated by your vet. Ask your vet how this applies to your cat.

How often should my pet have a fecal test?

CAPC recommends at least four fecal examinations in the first year of life and at least twice a year for healthy adults, adjusted for health, environment and lifestyle.

Can indoor pets get heartworm?

Heartworm spreads through mosquito bites, and the American Heartworm Society notes mosquitoes can survive indoors in protected areas, so ask your vet whether prevention is advised for an indoor pet.