Flea vs Tick
Verdict: Fleas are tiny, flat-sided, wingless insects that jump. Ticks are eight-legged arachnids that crawl, latch on and swell as they feed. A bug attached and growing for days is a tick, and a hopper in the fur is a flea.
Fleas are insects. Adults are dark brown to black, under 1/8 inch long, flattened from side to side and wingless, with big hind legs for jumping. Ticks are arachnids, related to spiders and mites. Nymph and adult ticks have eight legs and crawl onto a host from vegetation.
The practical difference is how they bite. A flea bites and hops, leaving clusters of itchy red bumps, often on the lower legs. A tick grabs on and feeds for minutes to days, and some carry diseases such as Lyme disease. A tick should be removed promptly with fine-tipped tweezers.
Flea vs Tick side by side
| Trait | Flea | Tick |
|---|---|---|
| Type of animal | Insect | Arachnid (related to spiders and mites) |
| Legs | Six | Eight as nymph or adult (larvae have six) |
| Adult size | Under 1/8 in (about 1/16 in for the cat flea) | Nymphs poppy-seed size; a fed female can reach raisin size |
| Body shape | Flattened side to side, wingless | Flat, teardrop shape unfed; swells when fed |
| Movement | Jumps with large hind legs | Crawls; waits on vegetation and grabs a passing host |
| Feeding | Bites and hops; bites often in clusters on lower legs | Attaches and feeds for minutes to days |
| Life cycle | Adults live 1 to 12 months; whole cycle takes two weeks to two years | Four stages: egg, larva, nymph, adult |
| Main health risk | Itchy bites; allergic reactions in some | 15 tickborne diseases in the U.S., such as Lyme disease |
| Where found | On pets and in homes | Wooded areas, lawns and roadsides, depending on species |
Last verified October 2026. Typical values; individual animals, products and local prices vary.
When you are looking at which
Flea
- A tiny dark insect that jumps off your pet or sock and is hard to catch.
- A cluster of itchy red bumps around the ankles with no attached bug.
- Itchy bites that keep returning until both the pet and the home are treated.
- A flattened-sided body that looks like a sesame seed on its edge.
Tick
- A bug firmly attached to the skin that does not move off easily.
- A small crawler on a trail hiker, pet or clothing after time in woods or tall grass.
- A body that is swollen like a raisin after feeding for days.
- A round, flat bug with eight legs and no wings, seen under a magnifier.
How this works
The quiz covers movement, leg count, bite pattern, body shape and where you picked it up. Each answer favors flea or tick and the more cues agree, the better the result. Leg count is the strongest cue, but you need a magnifier, so the quiz also asks about movement and how the bite looks.
It can only describe what the visitor sees, and tick larvae and engorged ticks look different from adults. If a tick has been attached, keep the date in mind and talk to a clinician about symptoms. Larvae and engorged ticks are hard to recognize, so if you cannot tell what it is and it is attached, remove it and ask a clinician.
Where these numbers come from
The figures and defaults on this page are based on:
- University of Minnesota Extension: Fleas, Flea size, shape, life cycle, hosts, bites and control (checked October 2026)
- University of Florida IFAS: Fleas (ENY-205), Flea body shape, jumping legs, cycle length and bite appearance (checked October 2026)
- Cornell IPM: Tick Biology, Ticks are arachnids, with leg counts by life stage and sizes (checked October 2026)
- CDC: Lyme Disease Basics, Lyme disease is spread by blacklegged tick bites, not fleas (checked October 2026)
- CDC: What to Do After a Tick Bite, Safe tick removal steps and when to see a clinician (checked October 2026)
General information, not medical or veterinary advice. Ask a clinician about a tick bite and a veterinarian about flea treatment for pets.
Frequently asked questions
Can fleas carry Lyme disease?
No. Lyme disease in the U.S. is spread by the bite of blacklegged ticks. Fleas mainly cause itchy bites and allergic reactions.
How do I remove a tick?
Use clean fine-tipped tweezers to grab it close to the skin, pull straight up with steady pressure, then clean the bite and your hands. Do not use petroleum jelly, heat or nail polish.
How long can fleas live on my pet?
Adult fleas can survive from 1 to 12 months, and the full cycle from egg to adult takes two weeks to two years depending on conditions. Treat both the pet and the home.
When should I see a doctor after a tick bite?
Contact a healthcare provider if you develop a rash or fever within several weeks of the bite. Tell them when and where it likely happened.
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