Bug Identifier
American Dog Tick
Community identification

American Dog Tick

Dermacentor variabilis

Order & Family
Ixodida/Ixodidae
Size
3mm to 5mm (unfed), growing up to 15mm when fully engorged.
See this bug in the Encyclopedia

Natural Habitat

Grassy areas, wooded paths, and low-lying vegetation where hosts are likely to pass.

Diet & Feeding

Obligate hematophage; feeds on the blood of mammals, including dogs, cattle, and humans.

Behavior Patterns

Uses a behavior called 'questing' where it clings to vegetation with hind legs and reaches out with front legs to grab passing hosts. It has a three-host life cycle (larva, nymph, adult).

Risks & Benefits

Significant health risk as a primary vector for Rocky Mountain Spotted Fever and Tularemia. It can also cause tick paralysis in humans and pets. It provides no significant ecosystem benefits to humans.