American dog ticks as their name describes, feed on the blood of dogs, as well as many other different animal hosts, including people. They are one of the largest ticks living in the northeast region, with adults growing to half an inch in length after feeding. These ticks are a reddish-brown color with white or yellow markings at their front end. Like all ticks, American dog ticks are wingless, adults have eight legs, and blood is their sole source of nutrition.