What diseases does the American Dog Tick carry?

The American Dog Tick is known to transmit: Rocky Mountain spotted fever, Tularemia.

Where are American Dog Ticks found?

American Dog Ticks are found in Eastern two-thirds of the US and Pacific coast. Their preferred habitat is grassy fields, roadsides, trail edges, meadows with low vegetation.

When is American Dog Tick season?

Peak American Dog Tick activity is during April–August.

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American Dog Tick

Dermacentor variabilis

Moderate Risk Risk

Known to transmit: Rocky Mountain spotted fever, Tularemia

Total reports

Reports this week

About

One of the most commonly encountered ticks in the US. Larger than deer ticks and easier to spot. Prefers dogs but will bite humans. Found along trails, roadsides, and grassy areas.

Appearance

Brown with white/silver mottled markings on the back

Size

Adult female: 5mm unfed, up to 15mm engorged

Habitat & Range

Habitat

Grassy fields, roadsides, trail edges, meadows with low vegetation

Region

Eastern two-thirds of the US and Pacific coast

Peak Season

April–August

Life Stages

Larva (< 1mm)

Six legs. Feeds on small rodents.

Nymph (1–2mm)

Rarely bites humans.

Adult Female (5mm)

Brown with silvery-white ornate markings.

Adult Male (3.5mm)

Heavily mottled silver/white pattern.

Safety Tips

1.Larger and easier to spot than deer ticks
2.Most active in spring and summer
3.Common on dogs — check your pet after walks
4.Rocky Mountain spotted fever requires prompt treatment — see a doctor if you develop fever and rash