American Dog Tick
Identification
The most common tick people will find on their pet. Carrier of Rocky Mountain spotted fever, the deadliest tick-borne illness in the country. Untreated, RMSF kills in roughly a week.
Rocky Mountain spotted fever is the deadliest tick-borne illness in the country. The American dog tick is its most common American vector, despite the name suggesting otherwise.
Where to find it.
East of the Rocky Mountains throughout the continental US, with a separate Pacific Coast population in California.
Distribution Map
Source · CDC
Active Season
When this species is questing for hosts. Peak months in red are the highest-risk windows.
If it bit you.
A bite from this species carries a specific set of risks. The timeline below tells you what to watch for and when to act.
Rocky Mountain spotted fever is treatable with doxycycline, but it kills fast when missed. Fever within two weeks of a bite from this tick is an emergency until proven otherwise.
Remove and clean.
RMSF transmission requires several hours of attachment. Prompt removal substantially lowers risk.
Fever and rash watch.
RMSF starts with sudden high fever, severe headache, and muscle pain. A spotted rash appears 2 to 5 days later, often starting on wrists and ankles.
Window for treatment.
Doxycycline started within five days of symptom onset dramatically reduces mortality. After day eight, the disease is often fatal even with treatment.
Watch for paralysis.
Rare but real: an attached female can cause ascending paralysis from a toxin in saliva. Removing the tick reverses it within hours.
Diseases This Species Carries
For the general post-bite protocol, visit the Bitten page.
Gear for american dog tick country.
The four products that matter most when this species is the one you are likely to encounter.
Permethrin Spray
The dog tick is everywhere east of the Rockies. Treat field clothing, hunting gear, and dog bedding.
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Wondercide Flea & Tick Collar
The American dog tick is named for a reason. The collar repels fleas and ticks for up to four months, which covers a whole season for an outdoor dog.
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Wondercide Yard + Garden Spray
Treat the mowed edges where lawn meets brush. Cedar-oil based, so it knocks ticks down while staying safe around kids, pets, and pollinators.
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Tick Key
Engorged adult dog ticks are larger and harder to grip with tweezers. The key tool slides over the body and pulls cleanly.
Shop →Pack it. Print it. Pass it on.
The most-affected people are the least-informed. Forward this guide to anyone who hikes, hunts, gardens, owns a dog, has a child, or lives east of the Rockies. That covers most of the country.
Trusted Sources
Medical disclaimer. This field guide is general educational information, not medical advice, and is not a substitute for professional diagnosis or treatment. Tick-borne illness can be serious. If you develop a rash, fever, aches, or other symptoms after a bite, or if you are unsure, contact a healthcare provider promptly. In an emergency, call 911. Affiliate disclosure. Some product links in this guide are affiliate links; we may earn a small commission at no additional cost to you.