Deer Tick vs Dog Tick

Written by AZ Animals Staff
Published: January 3, 2022
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The deer tick and the dog tick are both ticks, but they are named because of the animal they prefer feeding on. Both leave bites on humans and can spread diseases. However, it is the deer tick that is known for Lyme disease. If you see one on you or have been bitten by one, you’ll need to know how to tell them apart. Read on to learn the facts about their identification through size, color, location, habitat, signs of either, and symptoms of Lyme disease or other tick-borne diseases, as well as treatment and prevention of each.

Comparing Deer Tick vs Dog Tick

Dog tickDeer tick
TaxonomyDermacentor variabilisIxodes scapularis
Common namesAmerican dog tick, wood tickDeer tick, black-legged tick
HostsDogs, cats, deer, raccoons, opossums, coyotes, small field mice, cats, humansDeer, dogs, cats & other outdoor pets, humans
SizeTwice the size of a deer tickSmall
HabitatOpen areas with tall grassWooded areas & backyards
ColorOff-white shield & red-brown bodyBlack shield & orange-red & brown body
Active seasonNymphs May-July, host search April-AugustNymphs May-August, adults October-May
DiseasesTick paralysis, tularemia, Rocky Mountain spotted feverLyme disease, babesiosis, anaplasmosis
Disease risk1/200 chance1/4 chance (1/3 adults and 1/5 nymphs carry)
Treatment & preventionDog & cat treatment, direct removal, inspections, yard upkeep, pesticidesDirect removal, antibiotics, inspections, yard upkeep, pesticides

The 6 Key Differences Between Deer Ticks and Dog Ticks


Knowing the facts about how these two different tick species look will help you with your identification of either. Size, color, and how they appear when engorged are all important. Both will look somewhat paler in color whereas feeding will make them engorged several times their normal size, although it’s only the females that do so.

The deer tick is the smallest of the two with nymphs being poppyseed-sized, and adults being sesame seed-sized. The dog tick is twice as large at 1/3 inch. Deer tick males are much smaller than females than dog tick males are compared to females. The dog tick has an off-white shield with a reddish-brown body, while the deer tick has a black shield with an orange-red and brown body. Plus, the dog tick is narrower even though it is larger.


Identification of the hosts each tick feeds on will also help you identify which is which. Adult dog ticks feed on dogs, cats, raccoons, deer, and field mice but will also feed on humans, and nymphs will seek out the smaller hosts. Adult deer ticks feed on larger hosts such as deer, dogs, and humans, while nymphs feed on cats, dogs, and humans.


Another feature that’s important for the identification of the tick is its location. Dog ticks can live their entire lifespan of two years indoors, but they came from the outdoors. Their natural habitat is open areas with tall grass. On the other hand, deer ticks are in wooded areas and backyards with trees and taller shrubbery. People tend to encounter dog ticks anytime outside, whereas they encounter deer ticks while hiking or in rural areas. Unkempt yards are another popular location for dog ticks.

Active Season

Knowing the facts about when each tick species is active will help you narrow it down to either. Dog tick nymphs are active in May through July and the adults are active April through August. Bites on humans are most common during spring and summer, and the ticks aren’t active during the fall and winter. Deer tick nymphs are active May through August and the adults October through May, with bites on humans being most common during the spring, summer, and fall.

Diseases & Risks

The risk of contracting Lyme disease as well as the higher rate of disease transmission in deer ticks is a major concern. Deer ticks can transmit Lyme disease, babesiosis, and anaplasmosis, while dog ticks can transmit tick paralysis, tularemia, and Rocky Mountain Spotted fever. However, the risk of contracting a disease is very different. Dog ticks have a one in 200 chance, and deer ticks have a one in four chance with one in three for nymphs and one in five for adults carrying Lyme disease.

Signs of a deer tick or dog tick bite on humans are small red bumps the size of a mosquito bite. Symptoms of Lyme disease include an expanding lesion or rash and flu-like aches, with effects ranging from mild to severe.

Treatment & Prevention

Finding an engorged tick means it’s recently fed. A tick can feed on its host for up to five days. With the risk of contracting a disease, such as Lyme disease, it’s important to directly remove ticks less than 48 hours after they’ve attached. Neither bites on humans nor pets need topical treatment other than cleaning unless there are symptoms of allergic reaction.

Inspection of personal items and pets coming in from outdoors as well as yard upkeep are good prevention methods, while pesticides for either and dog and cat treatments for dog ticks are effective treatments. It is common to use oral antibiotics of oral doxycycline as a prevention method for Lyme disease for anyone over eight years of age, usually if the tick was attached for 36 hours.

Next Up: Viceroy Butterfly Vs Monarch Butterfly: How to Tell The Look-Alikes Apart

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AZ Animals is a growing team of animals experts, researchers, farmers, conservationists, writers, editors, and -- of course -- pet owners who have come together to help you better understand the animal kingdom and how we interact.

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