I don't have an indoor cat, but my friend has one, and I was wondering if it needs flea treatments. He doesn't give it any, and it seems to be okay, but would giving it a flea treatment(s) be good for it, and if so, how often?

5 Answers 5


We've never done that with our cats as they're indoors, but the risk of fleas being introduced into the house through other means is probably your basis for consideration. If there is some chance of wildlife making it in or other pets visiting (like a friend's dog), then you might consider it. However, if it's gone this long without the treatment, I would probably deal with a flea situation as a one-off using flea soap when, or if, it happens.

Why put the poor cat through the indignity of a bath if you don't need to? Doing that is not a lot of fun...


Mind you, you could consider the spot-on treatments like Advantage Multi as a way of preventing. It's not hard to do and effective. As I said though, if there is no evidence of fleas, why do it?

  • There's a lot of stray cats around the neighborhood - dogs aren't much of a problem though. I'm pretty sure he doesn't have fleas and hasn't recently.
    – Timtech
    Oct 9, 2013 at 15:45
  • If he goes outside at all though, all bets are off... prevention is worth it then.
    – Joanne C
    Oct 9, 2013 at 15:47
  • He stays inside, but some of my friend's other cats go outside.
    – Timtech
    Oct 9, 2013 at 15:48

If fleas have a way into your house (via a dog, for example, or if you spend a lot of time outdoors in woods), then your cats could still get fleas that way. If this is the case, I suggest you use a flea comb regularly to look for flea dirt. A flea comb has extremely fine teeth; comb the cat every day and use a white cloth or tissue to wipe off the combings. Then look for small black specs. (These are dried blood, not flea poop, from what I understand.) Flea treatments don't innoculate the cat against fleas, so if there's been no exposure you don't get any benefit from the treatment from what I understand (but see below). Or so my vet has advised in the past; I'm not an expert on this. So, in general, you can wait for evidence that you have a flea problem before deciding to treat for it. (If you do treat, follow the package instructions, which vary.)

However, there may be non-flea-related reasons to use a flea treatment sometimes. Some topical flea treatments treat fleas and other conditions (like heartworm). If you want to treat for one of these other conditions, it's worth asking your vet about whether to use a flea treatment to cover both. One of my (indoor-only) cats is getting a flea treatment not because of fleas but because of other allergies, and it seems to be helping.

  • So flea treatments help against allergies?
    – Timtech
    Oct 9, 2013 at 20:22
  • One flea treatment helps against at least one cat's allergies. We're still not sure what he's allergic to. Oct 9, 2013 at 20:25
  • Oh okay :) As far as I know my friend's cat isn't allergic to anything.
    – Timtech
    Oct 9, 2013 at 20:26
  • Right, allergies might be a corner case (this was news to me). Both flea treatments I've used (Frontline and Revolution) also listed other things besides fleas that they help with, though I don't remember which was which. (I don't have the packaging handy.) Different types of worms, I'm pretty sure. Oct 9, 2013 at 20:28
  • While I understand the concern about fleas coming into the house, is there any evidence from research showing that fleas enter homes with pets, who never get out? Oct 9, 2013 at 21:01

Speaking from experience here: my husband and I purchased a house 18 months ago. Our 3 cats never go outside, but earlier this year we needed to flea treat the cats and the house.

The previous owners had dogs who were inside and out, and the very mild winter plus us not realizing there could be an issue meant that over the course of a year the flea population built up to where they became a problem.

It doesn't take much for fleas to take hold - we had no sign of trouble our first summer in the house, but by the next summer it was ugly.

I'd say that if your friend's cat stops whatever it's doing to bite and groom at the base of its tail or scratches a lot around its neck and behind the ears it's worth checking for flea dirt (tiny black specs) and egg cases (longer black bits that crumble under pressure). If your friend finds any, then he's going to need to treat the cat and also treat his floors and other surfaces to kill any fleas or eggs in the house. Usually it's a dose every 6 - 8 weeks unless you've got a severe infestation, when you treat more often. Also, older cats are more vulnerable to fleas so they need to be watched more carefully.

If there's no sign the cat has flea problems, then there's no need to treat it.


I have had 3-4 indoor cats. Two of them I've had for around 14 years. One of those, is/was a jailbreak artist who has managed to leave the house for her own adventures typically lasting 6-12 hours.

I have NEVER ever had flea problems. The only time I used flea / parasite treatment was when we adopted the second cat (who we literally found on the street).

I have heard of indoor only cats that never go out getting fleas (the exact mechanism is unknown, perhaps fleas go through some opening in the wall, perhaps squirrels, raccoons, mice, whatever bring the fleas in).

But I wouldn't treat for fleas unless you have fleas.

  • Many of the flea treatments also kill parasites, which are harmful, but not nearly as obvious as fleas. Jun 26, 2014 at 18:27
  • They might kill other external parasites like ticks... but won't touch internal parasites. All the commercial remedies for parasites work but have non-negligible toxicity to the host; in my opinion the home remedies (aside from manual removal, and maybe soap) don't work terribly well (the toxicity to the parasite is low and the ratio of toxicity (host/parasite) is higher than the commercial stuff)
    – Dan S
    Jun 26, 2014 at 23:01
  • 1
    @James Jenkins I stand corrected, that seems to kill external and at least some internal parasites, and it looks rather selective to boot.
    – Dan S
    Jun 27, 2014 at 3:09

Every cat, indoors or outdoors, MUST be protected against fleas! Fleas enter the home via hosts such as dogs, YOU, or inanimate objects that are brought inside from outside (such as shopping).

They need to be treated once a month. Fleas can be very hard to detect, and if your cat has fleas, they will most certainly have tapeworm too. The endo and ectoparasites go hand in hand.

You can use an OTC treatment such as Advantage 2, or have your vet prescribe Revolution, which is my personal favorite because it protects cats against all endo and ecto parasites, apart from ticks. However, you will also need something to treat the tapeworm, so a wellness check at your vets will be ideal. It’s the responsible thing to do as a pet parent.

  • Hi Emily, thanks for valuable insight and welcome to Pets.
    – lila
    Aug 2, 2020 at 13:16
  • this is very dependent on where you live,i have had outdoor cats for 52 years and have never had a cat infected by fleas.i had a feral cat a few years ago and he had cat lice,it was the first time in 25 years my vet had ever seen cat lice. Aug 2, 2020 at 13:19
  • I've had cats for over 30 years, indoor-only, indoor-outdoor, and outdoor-only. Not one was ever treated for fleas, and not one ever had a single flea on them. You may live in an area where fleas are more common, or you may have had someone convince you they're lurking everywhere, but that's not necessarily the case everywhere.
    – Allison C
    Aug 3, 2020 at 13:01

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