How to Detect Fleas

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It’s common for house pets—typically dogs—to encounter fleas and come home with a coat full of them. Flea infestations only worsen with time (and can easily spread to other animals), so it’s important to detect and get rid of the fleas as soon as possible. In some cases, a house itself can be infested with fleas (e.g. from a previous owner whose pets brought fleas indoors). You can detect fleas in animals by their itching behavior, and in your house by inspecting for fleas, their droppings, and their eggs.

Method 1
Method 1 of 2:

Detecting Fleas on an Animal

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  1. Flea bites are irritating to pets, which causes pets to scratch the locations in which they’re being bitten by fleas. If you notice your dog or cat scratching or biting at their fur frequently, it is a good sign that they’re covered in fleas. [1]
    • It’s natural for animals to scratch themselves occasionally under normal circumstances. Animals with fleas, though, will scratch frequently, for long periods of time.
  2. If you’ve noticed an animal scratching constantly, take a look at their skin and hair. The skin of animals infested with fleas is often reddened and raised. Many animals with fleas itch and bite at themselves so forcefully that they pull out small patches of hair. [2]
    • On animals with heavy coats, you’ll need to manually part the hairs so you can see down to their skin.
    • If you do part the hairs, be sure to wash your hands immediately afterwards.
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  3. If your pet has red, raised patches of skin or missing hair clumps, look for the fleas themselves. To do this most effectively, roll your pet over onto their back. Then look in the pet’s armpit and groin areas—the pet’s coat will be thinner here, giving the fleas less dense fur to hide themselves in. [3]
    • It’s best to wear a pair of gloves (e.g. latex gloves) when you inspect your pet and handle their fut. Fleas can transfer from dogs to humans, so take precaution to make sure this doesn’t happen.
  4. Fleas are tiny—ranging from 1 ⁄ 8 inch (0.32 cm) to 1 ⁄ 16 inch (0.16 cm)—which makes them often hard to spot. The body of a flea has 6 legs, and they are typically black or dark brown in color. Flea bodies are shaped approximately like an avocado, and have a scaly appearance. [4]
    • Fleas are tremendous jumpers—they can leap fast and high, and you may spot them jumping from one part of your pet to another.
  5. The close-set teeth of a flea comb are specifically designed to trap fleas. If you spot many small, black or brown dots in the teeth of the comb after running it through your pet’s coat, it’s a sure sign they’re infested with fleas. [5]
    • When combing your pet, make sure to comb deep enough to catch any fleas hiding near the pet’s skin.
    • You can purchase a flea comb at your veterinarian’s office, at a pet-supply store, or in the pet section of a supermarket.
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Method 2
Method 2 of 2:

Detecting Fleas in Your House

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  1. Pull the socks as high up on your calves as possible, and spend at least 10 minutes walking around with the socks on. Fleas will leap out on to the socks to catch a ride. After walking through your house, take the socks off and inspect them for fleas. [6]
    • Take an extra lap or two through carpeted areas that flea are likely to inhabit. You can also shuffle your feet across carpets and rugs. This will build up friction, and the warmth will draw the fleas out.
  2. Flea dirt is the name commonly used to describe the small, visible droppings of fleas, which look like little bits of dirt. You’ll most likely find clusters of flea dirt on the floor of your home, or in rugs and carpets. To confirm that the specks are flea dirt, rub a damp paper towel over them. Flea dirt will leave reddish streaks behind. [7]
    • A clump of flea dirt often resembles a pile of fine-ground black pepper.
  3. Carpets and rugs are often safe havens for fleas, and places where fleas can lay their eggs in relative safety. In order to inspect carpets for flea eggs, put on a pair of light-colored latex or plastic gloves and run your fingers through the fibers of the rug. Flea eggs are very small and are white and oval-shaped. [8]
    • You may need to use a magnifying glass to look for flea eggs in the carpet and on your hands.
  4. If you often walk around your house barefoot, you may be a frequent victim of flea bites yourself. Fleas seldom bite humans above the knee, but their bites are itchy and cause small red bumps. You can tell flea bites apart from mosquito or spider bites by their differing appearances.
    • Unlike mosquito bites, flea bites cause very little swelling.
    • Unlike spider bites, flea bites only have one small puncture hole, not two.
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Expert Q&A

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  • Question
    What home remedies will kill fleas in your carpet?
    Kevin Carrillo
    Pest Control Specialist, MMPC
    Kevin Carrillo is a Pest Control Specialist and the Senior Project Manager for MMPC, a pest control service and certified Minority-owned Business Enterprise (MBE) based in the New York City area. MMPC is certified by the industry’s leading codes and practices, including the National Pest Management Association (NPMA), QualityPro, GreenPro, and The New York Pest Management Association (NYPMA). MMPC's work has been featured in CNN, NPR, and ABC News.
    Kevin Carrillo
    Pest Control Specialist, MMPC
    Expert Answer
    Realistically, there aren't any. Fleas are really sturdy creatures with thick exoskeletons. It's extremely difficult to drown or suffocate a flea, and most of the stuff that's sitting around your home that could theoretically kill a flea will end up ruining your carpet. If you really want to kill the fleas in your carpet, you're going to need to buy or rent a steamer. This is in addition to the other flea removal tools you're using, such as bug bombs and cleaning.
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      • Fleas prefer to live in warmer climates. They prefer weather above 35 °C (95 °F). If you live in a region where winter temperatures fall below 35 °C (95 °F) for more than 40 hours each week, you likely won’t need to worry about fleas during this time. [9]
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      References

      1. ↑ https://www.orkin.com/pests/fleas/how-to-detect-signs-of-a-flea-infestation
      2. ↑ https://www.orkin.com/pests/fleas/how-to-detect-signs-of-a-flea-infestation
      3. ↑ https://www.petmd.com/dog/parasites/evr_dg_does_my_dog_have_fleas
      4. ↑ https://www.petmd.com/dog/parasites/evr_dg_does_my_dog_have_fleas
      5. ↑ Kevin Carrillo. Pest Control Specialist, MMPC. Expert Interview. 22 October 2019.
      6. ↑ https://www.petcarerx.com/article/how-to-detect-a-flea-infestation-in-a-new-home/162
      7. ↑ https://www.petcarerx.com/article/how-to-detect-a-flea-infestation-in-a-new-home/162
      8. ↑ Kevin Carrillo. Pest Control Specialist, MMPC. Expert Interview. 22 October 2019.
      9. ↑ https://www.petmd.com/dog/parasites/evr_dg_does_my_dog_have_fleas

      About This Article

      Article Summary X

      There are a few common signs to watch out for to detect fleas on your pet. The most common sign is your pet scratching or biting itself more than usual, since fleas can be really itchy. You may also notice red skin and missing patches in its fur if it's been scratching a lot. If you think your pet might have fleas, check its fur for tiny black or brown insects, especially in its armpit and groin areas, where you’ll be able to spot them more easily. Use a flea comb to check its fur. You can also use a magnifying glass to identify the fleas. For more tips, including how to detect fleas around your home, read on.

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