This map highlights the number of reported positive cases of
ehrlichiosis, Lyme disease, heartworm disease and anaplasmosis
in dogs across all the regions of the United States and Canada.
Because so many dogs go untested for vector-borne diseases, the
actual number of dogs infected by ticks is likely many times
higher than what is shown here.
The maps indicate recorded positives from more than 10,000
veterinary clinics, telephone surveys and IDEXX Reference