Brown Dog Tick
A reddish-brown three-host tick that strongly prefers dogs as its host and is unusual in being able to complete its entire life cycle indoors, infesting homes and kennels.
Key facts
| Scientific Name | Rhipicephalus sanguineus |
|---|---|
| Beneficial Status | none |
| Class | Arachnida |
| Family | Ixodidae |
| Genus | Rhipicephalus |
| Kingdom | Animalia |
| Order | Ixodida |
| Organism Type | arachnid |
| Pest Status | True |
| Phylum | Arthropoda |
| Professional Recommended | yes when established indoors |
| Protected Status | none |
| Risk Level | high |
| Species | Rhipicephalus sanguineus |
| Taxon Authority | (Latreille, 1806) |
| Treatment Recommended | True |
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Overview
The brown dog tick is a reddish-brown tick that piles up around dogs and is one of very few ticks able to finish its whole life cycle inside a house, which is as unwelcome as it sounds. Following dogs nearly everywhere, it is also the most broadly distributed tick on the planet. Source: https://ask.ifas.ufl.edu/publication/IN378 Living on dogs and around the home, it threatens both: it spreads several diseases to dogs and, in some regions, can pass Rocky Mountain spotted fever to people. Source: https://extension.umaine.edu/ticks/maine-ticks/brown-dog-tick-or-kennel-tick/
Identification
Adults are reddish-brown with a stretched-out oval body and none of the pale ornate markings of some other ticks. Unfed adults are small, roughly 2 to 3 mm long; a nymph is about 1 mm and the larva around half a millimeter. Source: https://ask.ifas.ufl.edu/publication/IN378 A reliable close-up clue is the six-sided (hexagonal) basis capituli, the plate behind the mouthparts. Once fed, a female balloons to roughly a hundred times her starting size, fading to gray and swelling to about the bulk of a raisin. Source: https://ask.ifas.ufl.edu/publication/IN378 In field terms, unfed females run about one-eighth to one-quarter inch and reach half an inch when engorged; males are slightly smaller. Source: https://extension.umaine.edu/ticks/maine-ticks/brown-dog-tick-or-kennel-tick/
Lookalikes
It is easy to confuse with the American dog tick. The brown dog tick stays plain, with no markings on its back, whereas the American dog tick carries gray-to-silver markings on its dorsal shield. Source: https://ask.ifas.ufl.edu/publication/IN378 Source: https://ask.ifas.ufl.edu/publication/IN781 Habitat is the other giveaway. The American dog tick favors wooded, brushy, and tall-grass areas outdoors, so ticks turning up indoors or repeatedly on a house dog point to the brown dog tick instead. Source: https://ask.ifas.ufl.edu/publication/IN781 Source: https://www.canr.msu.edu/resources/brown-dog-tick
Biology
As a three-host tick, the larva, nymph, and adult each attach for one blood meal, then drop off to molt or lay eggs. A well-fed female is prolific, laying several thousand eggs (often around 4,000) in cracks and crevices indoors or in dog runs. Source: https://ask.ifas.ufl.edu/publication/IN378 Development tracks temperature; in warm conditions the full cycle finishes in about two months, allowing up to four generations a year. Source: https://www.canr.msu.edu/resources/brown-dog-tick
Where Found
Dogs are the main host at every stage. Its defining trait is completing the whole life cycle indoors as well as out, thriving in homes, kennels, and dog runs. Source: https://ask.ifas.ufl.edu/publication/IN378 It occurs across the United States but fares poorly outdoors in much of the country, favoring warm, dry, dog-occupied indoor spaces. Source: https://www.canr.msu.edu/resources/brown-dog-tick
Seasonality
Outdoor activity leans toward warmer months, but because this tick lives indoors so readily, an established home or kennel infestation cycles year-round. Source: https://ask.ifas.ufl.edu/publication/IN378 That indoor pattern is why human disease cases tied to this tick in Arizona occur year-round, with exposure happening in and around the home. Source: https://www.cdc.gov/rocky-mountain-spotted-fever/hcp/clinical-overview/index.html
Signs
The sign owners usually notice first is ticks climbing indoor walls, curtains, or door frames, a hallmark of this tick. Source: https://ask.ifas.ufl.edu/publication/IN378 In heavy infestations they pour out of furniture, baseboards, moldings, and gaps around outlets, and attached ticks on the dog are another telltale. Source: https://www.canr.msu.edu/resources/brown-dog-tick
Risks
For dogs this is a serious threat: when it feeds it transmits the agents of canine ehrlichiosis and canine babesiosis [UF/IFAS; University of Maine]. Source: https://ask.ifas.ufl.edu/publication/IN378 Source: https://extension.umaine.edu/ticks/maine-ticks/brown-dog-tick-or-kennel-tick/ For people the main concern is Rocky Mountain spotted fever. The brown dog tick is recognized as one of the ticks that pass this illness to humans, a link confirmed by both the CDC and university tick researchers [CDC; University of Wisconsin]. Source: https://www.cdc.gov/rocky-mountain-spotted-fever/hcp/clinical-overview/index.html Source: https://wisconsin-ticks.russell.wisc.edu/rhipicephalus-sangineus/ The disease comes from a bacterium, Rickettsia rickettsii, and in parts of Arizona and northern Mexico it strikes harder than elsewhere, with high incidence and death rates that fall most heavily on children. Source: https://www.cdc.gov/rocky-mountain-spotted-fever/hcp/clinical-overview/index.html University tick researchers tie it to a documented Arizona cluster on tribal lands that logged more than 300 cases and 20 deaths between 2002 and 2011. Source: https://wisconsin-ticks.russell.wisc.edu/rhipicephalus-sangineus/
Is It A Pest
Yes. Established in or around a home, kennel, or yard, brown dog ticks are a genuine pest of pets and people, and an indoor population should be treated rather than tolerated. Source: https://ask.ifas.ufl.edu/publication/IN378
Beneficial Notes
The brown dog tick has no recognized beneficial role. It is purely a blood-feeding ectoparasite and disease vector, with no pollinating, predatory, or decomposer value. Source: https://ask.ifas.ufl.edu/publication/IN378
When Not To Treat
Correct identification comes first, since not every tick on a dog is a brown dog tick. When only a stray tick or two turns up with no sign of indoor activity, careful removal and monitoring beats treating the whole house. Source: https://www.canr.msu.edu/resources/brown-dog-tick Tick medications should also be chosen with a veterinarian, since not every dog suits every product. Source: https://ask.ifas.ufl.edu/publication/IN378
Prevention
The best strategy is heading off infestations early by checking dogs for ticks whenever they return from kennels, groomers, or dog parks. Source: https://ask.ifas.ufl.edu/publication/IN378 Wash and dry dog beds and blankets on hot settings to kill hiding ticks, and steam whatever cannot be laundered. Source: https://ask.ifas.ufl.edu/publication/IN378 Seal indoor cracks, keep grass short, and clear clutter to cut hiding spots, and during warmer months check the whole family and pets for ticks daily. Source: https://acis.cals.arizona.edu/community-ipm/home-and-school-ipm-newsletters/ipm-newsletter-view/ipm-newsletters/2020/09/03/brown-dog-ticks-and-repellents
Treatment
Indoor control is difficult and an established infestation usually warrants a professional, since these ticks breed in wall voids, baseboards, and furniture, not just on the dog. Source: https://ask.ifas.ufl.edu/publication/IN378 Work three fronts at once: the dog (vet-selected products and manual removal), the indoors (sanitation, sealed harborage, laundered bedding), and the outdoor rest areas. Source: https://ask.ifas.ufl.edu/publication/IN378 Chemically, a labeled pyrethroid pesticide can be applied around and under the structure outdoors to knock back tick numbers. Source: https://acis.cals.arizona.edu/community-ipm/home-and-school-ipm-newsletters/ipm-newsletter-view/ipm-newsletters/2020/09/03/brown-dog-ticks-and-repellents Do not lean on permethrin alone for the dog: although it is the most-applied topical product, resistant ticks have been documented in the United States, so leave the on-animal product choice to the veterinarian. Source: https://ask.ifas.ufl.edu/publication/IN378
Inspection
Inspect dogs first, since they drive the infestation, and check any dog entering a kennel, because one infested animal can seed a building. Source: https://ask.ifas.ufl.edu/publication/IN378 Indoors, probe the elevated harborage these ticks favor, checking behind baseboards, moldings, and outlet covers. Source: https://www.canr.msu.edu/resources/brown-dog-tick
Kids
The brown dog tick is a tiny eight-legged bug, a cousin of spiders, that drinks blood and loves dogs so much it moves into the house, like the world's worst roommate. It is reddish-brown and very small until it fills with blood, then turns fat and gray like a little raisin. Source: https://ask.ifas.ufl.edu/publication/IN378 Ticks can carry germs that make dogs and people sick, so if you find one, tell a grown-up instead of touching it. Source: https://extension.umaine.edu/ticks/maine-ticks/brown-dog-tick-or-kennel-tick/
Sources
How we know: taxonomy from ITIS; identification, biology, signs, and management from UF/IFAS, Michigan State, University of Arizona, and University of Maine extension (the lookalike contrast from a second UF/IFAS publication); Rocky Mountain spotted fever paired between the U.S. CDC and the University of Wisconsin tick program. Source: https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=Scientific_Name&search_value=Rhipicephalus+sanguineus
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