How to Identify Ticks in Michigan (With Photos and Size Guide)

Quick ID:

• Blacklegged tick (deer tick) — small, dark, reddish abdomen, sesame-seed sized. Carries Lyme.
• American dog tick — larger, brown with white/gray mottled markings. Most commonly seen in MI.
• Lone star tick — medium, single white "star" dot on females. Newly established in southern MI.
• Woodchuck tick — uncommon, near burrows, rarely encountered by people.
• Brown dog tick — uniformly reddish-brown, no markings. The one tick that can breed entirely indoors.

This article is for informational purposes only and is not medical advice. If you have been bitten by a tick or are experiencing symptoms, contact a healthcare provider.

Why correct ID matters

Not every tick in Michigan carries disease, and not every tick bite is the same kind of risk. Knowing which species bit you (or your dog, or your child) tells you:

• Whether Lyme disease is even on the table
• How urgently you need to monitor for symptoms
• Whether you should bring the tick to your doctor or save it for testing

The good news: of the dozens of tick species in North America, only five show up in Michigan with any regularity, and they're easy to tell apart once you know what you're looking at.

The size problem

Before we get to species, the single most important thing to understand about ticks is how small they are at the most dangerous life stage.

Tick size by life stage:

• Larva: smaller than a grain of sand. Six legs. Rarely carries disease.
• Nymph: about the size of a poppy seed. Eight legs. The most dangerous stage — often missed in tick checks because of its size.
• Adult: about the size of a sesame seed (or larger). Eight legs. Easier to spot.

Most people imagine ticks as the engorged, bean-sized creatures they've pulled off a dog. That's an adult that has fed for days. The unfed nymphs that transmit most Michigan Lyme cases are smaller than the period at the end of this sentence.

When you do tick checks, you are looking for specks.

The five ticks of Michigan

1. Blacklegged tick (deer tick)

Ixodes scapularis

The most important Michigan tick from a health standpoint. This is the species that transmits Lyme disease, anaplasmosis, babesiosis, and (rarely) Powassan virus.

How to identify:

• Size: adults about a sesame seed; nymphs about a poppy seed.
• Body shape: flat, oval, longer than wide.
• Color: dark brown to black legs and head. Females have a black scutum (the shield behind the head) with a reddish-orange abdomen — the most diagnostic feature. Males are uniformly dark.
• No white markings. This is the easiest way to distinguish them from dog ticks.

Where you'll find them: wooded areas, leaf litter, the edge between lawns and woods, low brush. Common throughout Michigan as of 2026 — confirmed established in all 83 counties.

When they're active: adults any time temperatures are above 40°F (including warm winter days). Nymphs peak May through July.

Disease risk: the highest in Michigan. If a blacklegged tick has been attached for more than 24 hours, contact your doctor.

2. American dog tick

Dermacentor variabilis

The most commonly encountered tick in Michigan, especially in grassy and open areas. Despite the name, they bite people too.

How to identify:

• Size: noticeably larger than a blacklegged tick — adults are about the size of a watermelon seed unfed, larger when engorged.
• Color: brown body with distinctive white or gray mottled markings on the back. Females have a small white shield; males have white marbling across the entire back.
• Build: more rounded than blacklegged ticks.

Where you'll find them: roadsides, fields, grassy trails, lawn edges. Less common in deep woods.

When they're active: April through August.

Disease risk: generally low in Michigan. Can transmit Rocky Mountain spotted fever and tularemia, but both are rare here. American dog ticks do not transmit Lyme disease.

3. Lone star tick

Amblyomma americanum

Historically a southern species, but climate shifts have pushed populations into southern Michigan, and they're now considered established in several counties. The species responsible for alpha-gal syndrome — a delayed allergic reaction to red meat.

How to identify:

• Size: medium — between blacklegged and American dog ticks.
• Color: reddish-brown. Females have a single, distinctive white "lone star" dot in the center of the back. Males have variable white markings around the edge.
• Build: rounded, with long mouthparts.

Where you'll find them: wooded and brushy areas in southern Lower Peninsula counties.

When they're active: April through September.

Disease risk: transmits ehrlichiosis, tularemia, and is the primary cause of alpha-gal syndrome. Does not transmit Lyme disease.

4. Woodchuck tick

Ixodes cookei

Less commonly encountered by people, but worth knowing because it can rarely transmit Powassan virus.

How to identify:

• Size: similar to the blacklegged tick.
• Color: uniformly light brown, no distinctive markings.
• Build: similar to blacklegged tick but with subtle anatomical differences (most people can't reliably distinguish them in the field).

Where you'll find them: near woodchuck, skunk, and small mammal burrows in rural Michigan.

When they're active: spring and summer.

Disease risk: low frequency of human encounters, but can rarely transmit Powassan virus.

5. Brown dog tick (kennel tick)

Rhipicephalus sanguineus

The most important tick for homeowners to recognize. Unlike every other tick on this list, the brown dog tick can complete its entire life cycle indoors — meaning a single infested dog can seed a year-round home infestation.

How to identify:

• Size: small to medium — similar to a blacklegged tick, slightly more elongated.
• Color: uniformly reddish-brown with no white or silver markings. This is the easiest way to tell it apart from the American dog tick.
• Build: long, narrow body. Most often found on dogs (especially around the ears and between the toes), in dog beds, kennels, baseboards, or behind furniture.

Where you'll find them: primarily indoors — homes, kennels, and dog runs. Rarely encountered outdoors in Michigan compared to other species.

When they're active: year-round indoors.

Disease risk: can transmit Rocky Mountain spotted fever and several canine diseases (ehrlichiosis, babesiosis in dogs). Does not transmit Lyme disease. The bigger concern with brown dog ticks isn't a single bite — it's an indoor infestation that grows quietly over months.

Common tick lookalikes

Some bugs get mistaken for ticks. If yours has any of these features, it's probably not a tick:

• Six legs (as an adult). Adult ticks have 8 legs. If you count 6, it's likely a louse, bedbug, or other insect.
• Visible wings or wing buds. Ticks have no wings.
• A clear segmented body with a narrow waist. That's a beetle or bedbug, not a tick.
• Antennae. Ticks don't have them.

If in doubt, take a clear photo from above with something for scale (a coin works well) and compare against the TickEncounter or MSU Extension reference photos.

How to ID an engorged tick

This is where it gets harder. Once a tick has fed for hours or days, it swells into a gray, bluish, or green-tinged sac and the species-specific markings get distorted or hidden. A few tips:

• Look at the legs and head first — these don't change much when engorged.
• Examine the scutum (the shield behind the head). On female blacklegged ticks, the dark scutum stays visible even on engorged specimens.
• Photograph it before and after removal — the photo helps your doctor or a tick ID service make a call.

What to do once you've identified it

• Blacklegged tick attached less than 24 hours: Save tick, monitor for symptoms for 30 days.
• Blacklegged tick attached 24+ hours: Call your doctor, mention attachment time.
• American dog tick: Save tick, monitor for symptoms for 30 days.
• Lone star tick: Save tick, monitor for fever and red-meat reactions.
• Woodchuck tick: Save tick, monitor for symptoms; rare encounter.
• Unknown / unsure: Save tick, take photos, contact local health department or doctor.

In every case: remove the tick correctly (fine-tipped tweezers, steady upward pull — the full method is in how to remove a tick safely), clean the bite, save the specimen with the date, and watch for early Lyme disease symptoms for 30 days.

Identifying ticks on pets

Same species, same identification — but ticks on dogs and cats are usually found in specific spots:

• Around the ears and inside the ear canal
• On the neck and under the collar
• Between the toes and around the foot pads
• Around the eyes and muzzle
• Under the legs and on the belly

If you find a tick on your pet, follow the same removal protocol you'd use on yourself. Then ask your vet whether the species and attachment time warrant testing or preventive treatment.

Can ticks survive inside your home?

A common assumption is that any tick brought indoors quickly dries out and dies. That's mostly true — but "mostly" is doing a lot of work. In March 2026, Ohio State University researchers published the first hard numbers on how long ticks actually last inside a home, measuring survival across tile, wood, vinyl, and both short- and long-pile carpet.

The findings:

• Ticks survived one to three weeks indoors, depending on species and surface.
• Gulf Coast ticks lasted longest overall — roughly 18 days on average, stretching to about 25 days on vinyl.
• Lone star ticks averaged 11 days, surviving longest — nearly 15 days — in long-pile (shag) carpet, and shortest on tile at about a week.
• The two species diverged: shag carpet was where lone star ticks held on longest and where Gulf Coast ticks faded fastest, at around 10 days.

Ticks die when they dry out, and deep, soft surfaces trap humidity near the base of the fibers — which is why a lone star tick can outlast a week on tile by more than double in shag carpet. Pet beds, upholstered furniture, and the corners where dust and moisture collect work the same way. That the two species ranked surfaces differently is its own lesson: "it's been a few days, it must be gone" isn't a safe assumption for any of them.

This matters most for two species:

1. Brown dog ticks, which can establish a breeding population indoors.
2. Hitchhiking blacklegged or lone star ticks that ride in on clothing, gear, or pets after a hike.

Practical implications:

• Vacuum thoroughly after any outdoor activity that may have brought a tick inside — pay attention to baseboards, edges, and pet sleeping areas.
• Steam-clean carpets and upholstery during peak tick season (April–August). Heat plus moisture kills ticks at every life stage.
• Wash and dry pet bedding on high heat weekly during the season.
• Clothes go in the dryer first, not the washer. Cold-water washing can leave ticks alive — 10 minutes in a hot dryer kills them.

If you have an active dog and a heavy-pile carpet, you have the conditions ticks need to survive longer than you'd expect. The room-by-room version of this is in how to keep ticks out of your house, and the pet side is covered in the pet owner's tick prevention guide.

Tools that help with ID

• MDHHS free tick identification service — Michigan residents can email a clear, well-lit photo of the tick (top and bottom) to MDHHS-Bugs@michigan.gov. The state will reply with the species, life stage, and risk assessment. This is the fastest, most authoritative ID you can get in Michigan.
• TickEncounter Resource Center — free tick identification photos and submission service from the University of Rhode Island.
• MDHHS tick surveillance — Michigan-specific data and reporting.
• MSU Extension — Michigan State publishes practical, locally-relevant tick guides.
• Your local health department — can often help with ID, and some accept ticks for testing.

What to do after handling a tick

Wash your hands. Wash the bite area with rubbing alcohol or soap and water. If you found the tick on clothing or in your home, run the clothing through the dryer on high heat for 10 minutes — this kills any other ticks you may have missed.

For families with regular outdoor exposure, building these checks and dryer cycles into your routine is the easiest, cheapest defense against tick-borne illness this season.

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Keep ticks out of the places they hide

Identification is the first line of defense — cleaning is the second. Ticks that hitchhike inside don't need to find a host right away; they can wait out a multi-week stretch in vinyl, shag carpet, pet bedding, or upholstered furniture, biding their time.

That's where we come in. Puresome Cleaning offers chemical-free deep cleaning for carpet, upholstery, and pet areas across our Michigan service areas — the kind of work that removes the moisture-trapping debris ticks need to survive indoors. If you've had a known exposure, a heavy outdoor season with pets, or you're simply tired of wondering what's in the carpet fibers, we can help.

Request a free cleaning quote →

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Read next:

• Ticks in Michigan: The Complete 2026 Guide
• How to Remove a Tick Safely
• Lyme Disease Symptoms in Michigan

Sources: Centers for Disease Control and Prevention (CDC), Michigan Department of Health and Human Services (MDHHS), Michigan State University Extension, TickEncounter Resource Center.