Do indoor pets need flea and tick prevention?

Yes. Fleas hitchhike indoors on people and other animals, ticks come in on clothing and dogs, and most of a flea infestation lives in your home as eggs and larvae rather than on the pet. The Companion Animal Parasite Council recommends year-round prevention for all dogs and cats in all regions.

What diseases do ticks give dogs?

The big ones are Lyme disease (from the blacklegged or deer tick), anaplasmosis, ehrlichiosis, Rocky Mountain spotted fever, and babesiosis. Which are a risk depends on your region and which tick species live there, so local prevalence maps from the CAPC are worth checking.

How do I safely remove a tick?

Use fine-tipped tweezers, grasp the tick as close to the skin as possible, and pull straight up with steady pressure. Do not twist, crush the body, or use heat, petroleum jelly, or nail polish. Clean the bite afterward, and if mouthparts break off, leave them and let the skin heal.

Can I use my dog's flea treatment on my cat?

Not without checking the label. Many dog products contain permethrin, which is toxic to cats and causes tremors and seizures, even from close contact with a treated dog. Always use a product specifically labeled for cats.

How much does flea and tick prevention cost?

Typically around $120 to $400 a year depending on the product, your pet's size, and whether it also covers heartworm or worms. That is a market estimate that varies by region, and it is far cheaper than treating tapeworms, flea allergy, or a tick-borne disease.

Fleas, Ticks, and Tick-Borne Disease: What Actually Works to Protect Your Pet

Here is the short version: fleas and ticks are not a cosmetic nuisance, they are a health threat, and the way most people think about them is backwards. By the time you see fleas on your pet, the bulk of the problem is already in your carpets and bedding, and a single tick can carry a serious disease. The encouraging part is that prevention is cheap, effective, and simple if you do it consistently. This guide covers how these parasites actually work, what they spread, and the protection that holds up.

The flea problem you cannot see

Nearly every flea on dogs and cats is the same species, the cat flea, and it has a life cycle that explains why infestations are so stubborn. The adult fleas biting your pet are only about 5 percent of the total population. The other 95 percent are eggs, larvae, and pupae scattered through your home, in carpet, bedding, and floor cracks.¹ That is why treating only the pet, or only once, fails: the environment keeps restocking. A single female flea can lay dozens of eggs a day.²

~95%

of a flea infestation lives in the home as eggs, larvae, and pupae, not as adults on your pet

Companion Animal Parasite Council

Why fleas matter beyond the itch

Fleas cause more than scratching. They are the most common trigger of allergic skin disease in dogs and cats, a reaction so sensitive that a few bites can set it off, which we cover in allergic skin disease in cats. They also transmit the tapeworm Dipylidium caninum when a pet swallows a flea during grooming, and they spread Bartonella, the bacterium behind cat-scratch disease in people.² In a heavy infestation, especially in kittens and puppies, blood loss from fleas can cause real anemia.²

Ticks and the diseases they carry

Ticks are the bigger danger, because they transmit serious infections, and which ones depend on where you live and which tick species are there.³ A few that matter:

Blacklegged (deer) tick: Lyme disease, anaplasmosis, and babesiosis.
American dog tick: Rocky Mountain spotted fever.
Lone star tick: ehrlichiosis.
Brown dog tick: ehrlichiosis and, in some regions, Rocky Mountain spotted fever.

In dogs, the most talked-about is Lyme disease, which can cause fever, shifting lameness, and swollen joints, and is concentrated in the Northeast, upper Midwest, and mid-Atlantic.³ Anaplasmosis is less famous but widespread: national testing puts canine seroprevalence around 3 to 4 percent, rising toward 7 percent in the Northeast and upper Midwest.⁴ The CAPC publishes regularly updated prevalence maps, which are the right way to gauge your own local risk.³

Prevention that actually works

Modern prevention is genuinely effective. The most reliable options now are the isoxazoline class (active ingredients like afoxolaner, fluralaner, sarolaner, and lotilaner), available as monthly or longer-acting chews and as topicals, including cat formulations.⁵ Topical spot-ons and quality collars also work. Whichever you choose, two rules from the CAPC make the difference: use it year-round, not just in summer, and treat every pet in the household, because one untreated animal keeps the cycle going.¹

For completeness and balance, the isoxazoline class carries an FDA advisory noting that neurologic side effects (such as tremors or, rarely, seizures) have been reported in a small number of animals, which is worth a conversation with your vet if your pet has a seizure history.⁵ For most pets these products are safe and highly effective.

One product that can kill a cat

This warning earns its own section. Many flea-and-tick products made for dogs contain permethrin, which cats cannot metabolize. Applying a dog product to a cat, or even letting a cat groom a recently treated dog, can cause tremors, seizures, and death.⁶ Always read the label and use only cat-approved products on cats. We cover this and the other feline-specific poisons in the toxins that can kill a cat.

How to remove a tick the right way

If you find an attached tick, the technique matters.³ Use fine-tipped tweezers, grasp the tick as close to the skin as you can, and pull straight up with steady, even pressure. Do not twist or jerk, do not crush the body, and skip the old folk remedies, petroleum jelly, a hot match, or nail polish all do more harm than good. Clean the bite afterward. If the mouthparts break off and you cannot easily remove them, leave them and let the skin heal.

What it costs

Prevention typically runs about $120 to $400 a year depending on the product, your pet's size, and whether it bundles in heartworm and intestinal-worm coverage. That is a market estimate that varies by region. Weighed against treating flea allergy, a tapeworm, or a tick-borne illness, none of which is cheap, prevention is the easy financial call, and it pairs naturally with the heartworm prevention most pets are already on.

What to do this week

Put every pet in the home on a vet-recommended, year-round flea and tick preventive, including indoor-only cats.
Check a CAPC local prevalence map to see which tick-borne diseases are active in your area.
After walks in grass or woods, run your hands over your dog (and yourself) to find ticks early, and learn the straight-pull removal method.
Confirm every flea product in the house is labeled for the species you are using it on, and never put a dog product on a cat.

Fleas and ticks are the rare pet-health problem where good prevention is nearly complete protection. The tools work, they are inexpensive, and the only real failure mode is inconsistency, skipping the off-season or leaving one pet untreated. Cover everyone, all year, and you take fleas, tapeworms, flea allergy, and tick-borne disease largely off your pet's table at once.