Give flea and tick prevention all year, every year, at the interval printed on your product's label. For most products that's monthly; some chews and collars last longer. The Companion Animal Parasite Council recommends year-round, lifelong control for both dogs and cats, so there's no "off season" to plan around.
Your vet picks the product. Your job is giving it on time, every time, because the weeks after a forgotten dose are when fleas and ticks get their chance.
Do dogs and cats need flea and tick prevention all year?#
Yes. The Companion Animal Parasite Council's guidelines say all dogs and cats should be treated year-round and throughout their life with flea control, and give the same recommendation for ticks.
Winter doesn't reliably stop fleas. A centrally heated home is perfectly comfortable for them, and flea pupae can sit in carpet and bedding before hatching. Some ticks stay active on mild winter days, too. Stopping in October and restarting in spring leaves a window, and CAPC notes that once an infestation takes hold, a moderate to severe one can take several months to bring under control.
Year-round dosing also makes the schedule easier to keep. "The first of every month" is simpler to remember than "monthly, but only from roughly April to roughly November, depending on the weather."
Does an indoor cat need flea prevention?#
CAPC's recommendation covers all cats, indoor ones included. Fleas get in on dogs, on visiting animals, and sometimes on people. A single indoor cat who never meets another animal has lower risk, and that's a reasonable thing to talk through with your vet, but "indoor" on its own isn't a reason to skip it.
What decides which product your pet gets#
Your vet should choose the product with you, based on:
- species (this one matters most, see below)
- current weight, since products are sold in weight bands
- age, because each product has a minimum age
- pregnancy, nursing, seizure history, skin disease, and other medicines
- where you live and travel, which ticks are around, and whether your dog hikes, swims or boards
- what you'll actually manage to give on time, whether that's a chew, a topical or a collar
Keep the box or take a photo of the label. Brand families often contain different active ingredients, and "the green one from last year" doesn't tell the vet what your pet had. Weigh your pet again if they've grown or gained or lost weight, because a product for the wrong weight band is the wrong product.
Never use a dog flea product on a cat#
This is the most dangerous mistake on this page. Some dog flea and tick products contain permethrin and related insecticides that are highly toxic to cats. The EPA's pet flea and tick guidance says plainly: never use dog products on cats, or cat products on dogs, and apply only the amount meant for the animal's size.
Cats can also be exposed by cuddling up to a dog who's just been treated with a spot-on. If you have both, ask your vet which dog product is safe in a mixed household, and keep them apart for as long as the label says.
The CDC's tick guidance for pets is just as direct: cats are extremely sensitive to a variety of chemicals, so don't put any tick product on a cat without asking your vet first.
How to apply flea and tick treatment safely#
- Read the whole label, every time. Check species, weight range, minimum age, where to apply it, and the repeat interval.
- For a spot-on, part the fur and put it on the skin where the label says, usually between the shoulder blades where your pet can't lick it. Keep kids and other pets from touching the spot until it's dry.
- For a chew or tablet, watch your pet swallow the whole thing. Check the label for whether it should go with food.
- For a collar, fit it as directed and check the skin underneath every few days for redness or hair loss.
- Write down the date and product.
- Watch your pet for the rest of the day.
Don't stack products. A collar plus a spot-on plus a flea shampoo plus "natural" oils can mean a double dose of similar chemicals. Ask your vet before combining anything, and don't split a large-dog dose between smaller animals.
What to do if your pet reacts#
If your pet seems unwell after a treatment (drooling, vomiting, trembling, stumbling, or unusually agitated or flat), the EPA's advice is to bathe them right away with mild soap and plenty of water (for a topical), take off any flea or tick collar, and call your vet. In the US you can also call the National Pesticide Information Center at 1-800-858-7378. Bring the package with you. Seizures, collapse or trouble breathing are an emergency; go straight to an emergency vet.
Tick checks still matter on prevention#
No product stops every tick from climbing on. The CDC recommends checking pets daily for ticks if they go outdoors, and points to the spots ticks like most: in and around the ears, around the eyelids, under the collar, under the front legs, between the toes, on the back legs, and around the tail. Run your fingers through the coat slowly. On a long or dark coat, you'll feel a tick before you see it.
To remove one, CAPC's method is fine-tipped tweezers grasping the tick as close to the skin as possible and pulling straight out with slow, steady pressure. Don't twist, crush, burn or smother it with petroleum jelly or nail polish. Clean the bite, wash your hands, and if you live somewhere with Lyme or other tick-borne disease, ask your vet whether to keep the tick. Call them if your pet seems off in the weeks after a bite: lethargic, limping, or off food.
Getting rid of fleas in the house#
If you've seen adult fleas, there are eggs, larvae and pupae in your home too. They fall off your pet into bedding, carpet and sofa cushions.
- Treat every dog and cat in the household, not just the one who's scratching. CAPC says every pet in the home must be treated to control an established infestation.
- Vacuum floors, rugs, upholstery and the car daily for a couple of weeks, and empty the vacuum outside.
- Wash pet bedding and any blankets your pets sleep on, as hot as the fabric allows. Our guide to washing a dog bed covers inserts that can't go in the machine.
- Keep up the regular doses. You'll likely keep seeing new fleas for a while as pupae hatch. That doesn't mean the product has failed.
Use household or yard sprays only as labeled, and keep pets out of the area for as long as the label says. For a heavy infestation, a licensed pest control company working alongside your vet is worth the money.
Missed a dose?#
Check the label, or call your vet or the manufacturer, for what to do next and when the following dose is due. Don't double up to "catch up."
The more common problem in a busy house is two people both giving the dose. Make one person responsible, or keep a shared record that shows the product, the date given, and who gave it. A ChoreLists.com task that someone ticks off when the chew has actually been eaten does that job, and the next due date is right there.
Some products also cover heartworm or intestinal worms and some don't, and vaccines are a separate decision entirely, so go over the whole plan once a year at your pet's annual vet checkup and alongside their vaccination schedule. Bring the package.