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Background  The geographic distribution of canine infection with vector-borne disease agents in the United States appears to be expanding.    Methods  To provide an updated assessment of geographic trends in canine infection with  Dirofilaria immitis ,  Borrelia burgdorferi ,  Ehrlichia  spp., and  Anaplasma  spp., we evaluated results from an average of 3,588,477 dogs tested annually by veterinarians throughout the United States from 2010 – 2012.    Results  As in an earlier summary report, the percent positive test results varied by agent and region, with antigen of  D. immitis  and antibody to  Ehrlichia  spp. most commonly identified in the Southeast (2.9% and 3.2%, respectively) and antibody to both  B. burgdorferi  and  Anaplasma  spp. most commonly identified in the Northeast (13.3% and 7.1%, respectively) and upper Midwest (4.4% and 3.9%, respectively). Percent positive test results for  D. immitis  antigen were lower in every region considered, including in the Southeast, than previously reported. Percent positive test results for antibodies to  B. burgdorferi  and  Ehrlichia  spp. were higher nationally than previously reported, and, for antibodies to  Anaplasma  spp., were higher in the Northeast but lower in the Midwest and West, than in the initial report. Annual reports of human cases of Lyme disease, ehrlichiosis, and anaplasmosis were associated with percent positive canine test results by state for each respective tick-borne disease agent (R 2  = 0.701, 0.457, and 0.314, respectively). Within endemic areas, percent positive test results for all three tick-borne agents demonstrated evidence of geographic expansion.    Conclusions  Continued national monitoring of canine test results for vector-borne zoonotic agents is an important tool for accurately mapping the geographic distribution of these agents, and greatly aids our understanding of the veterinary and public health threats they pose.

Canine infection with Dirofilaria immitis, Borrelia burgdorferi, Anaplasma spp., and Ehrlichia spp. in the United States, 2010–2012