Several types of hookworms can cause disease in dogs. Ancylostoma caninum is the principal cause of canine hookworm disease in most tropical and subtropical areas of the world. Ancylostoma braziliense infects dogs and is sparsely distributed from Florida to North Carolina and along the Gulf Coast in the United States. It is also found in Central and South America and Africa. Uncinaria stenocephala is the principal canine hookworm in cooler regions. It is the primary canine hookworm in Canada and the northern fringe of the United States, but it is found with frequency across the country.