All pests

Brown dog tick (Rhipicephalus sanguineus)Brown dog tick

Rhipicephalus sanguineus (Latreille, 1806)

Brown dog tick

A reddish-brown tick that infests homes and kennels in the southern US.

Order
Ixodida
Family
Ixodidae
Group
Ticks & mites
Ontario status
Not established outdoors in Ontario, infests homes and kennels in the southern US

Why it matters

The only tick that infests buildings. Heavy infestations drain dogs (anemia), and it vectors canine ehrlichiosis and babesiosis, and in some regions, Rocky Mountain spotted fever in people.

Origin

Tropical/subtropical in origin; now worldwide wherever dogs live, it followed domestic dogs across the globe.

Behavior

Feeds almost exclusively on dogs but bites people when dogs are absent or infestations are heavy. Engorged ticks drop off and crawl upward to molt, often found high on walls.

Living conditions

Where dogs sleep: kennels, homes, dog runs. Uniquely among ticks, it can complete its whole life cycle INDOORS, in wall cracks, under rugs, behind baseboards.

Signs of presence

  • Ticks clustered on dogs, especially ears and between toes
  • Engorged gray-blue ticks crawling up walls
  • Tick casings and eggs in cracks near dog bedding
  • Dogs restless or anemic in heavy infestations

Weaknesses

  • Cannot survive Ontario winters outdoors, indoor-only here
  • Needs dogs (or dense hosts) to sustain a population
  • Engorged ticks climbing walls are conspicuous
  • Off-host stages hide in cracks, sealing and decluttering kennel areas removes shelter

Myths and facts

  • Myth Ticks can't live in houses.

    Reality This is the one species that can, it completes its entire life cycle indoors.

  • Myth It's only a warm-climate problem.

    Reality Outdoors yes, but heated kennels and homes let it persist anywhere dogs live.

Research notes

Morphology

Unfed adults 3-5 mm, reddish-brown, inornate (no white markings). Hexagonal basis capituli; festoons present. Engorged females swell to ~12 mm, gray-blue.

Diagnostics

Confirm by reddish-brown inornate body + hexagonal mouthpart base (basis capituli) + association with dogs and indoor habitat.

Easily confused with

  • American dog tick, Dermacentor variabilis Ornate white scutal patterning and a rectangular mouthpart base; does not infest buildings.

Life cycle

Adult
Adults feed 1-3 weeks and mate on the host; females lay one egg mass and die.
Egg
Hundreds to thousands laid in cracks near dog resting areas; hatch in ~2-6 weeks in warmth.
Egg to adult
~2-4 months indoors in warm conditions
Generations per year
Multiple overlapping generations per year indoors
Nymph or larva
Larvae and nymphs feed on dogs (usually), drop off, and molt in cracks.

Development

Egg → larva → nymph → adult; one blood meal per stage, usually on dogs.

Reproduction

Females lay 1,000-4,000 eggs per mass.

Distribution

Global
Cosmopolitan with domestic dogs
Native range
Tropical/subtropical (probable)
Ontario
Not established outdoors; indoor kennel infestations possible

Ecology

Endophilic, uniquely adapted to indoor and kennel microhabitats. Questing is minimal; ticks wait in cracks near dog resting sites. Dogs are the maintenance host.

Resistance

Acaricide resistance (including amitraz and pyrethroid tolerance) documented in some populations.

IPM implications

Monitoring targets dog resting areas and the cracks around them, not vegetation. Because the whole cycle happens indoors, inspection logic is structural: baseboards, crate seams, wall voids near dog beds. Populations grow geometrically in kennels, so early detection via the conspicuous wall-climbing engorged stage matters.

Chemical ecology

Assembly pheromones concentrate off-host stages in cracks near hosts; males produce attractants that draw females to feeding sites.

Genetics and DNA

Reference genome available: NCBI RefSeq GCF_013339695.2 (chromosome-level; from Jia et al., 2020, Cell, large-scale comparative tick genomics).

Taxonomy

Order Ixodida, family Ixodidae. Described by Latreille, 1806. A three-host tick strongly associated with domestic dogs; a species complex currently under revision.

Open questions

Species-complex taxonomy (tropical vs. temperate lineages); molecular mechanisms of acaricide resistance.

References

  • Dantas-Torres, F., Rhipicephalus sanguineus reviews, Vet. Parasitol.
  • Sonenshine & Roe 2014, Biology of Ticks
  • CDC, Tick-borne disease resources