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Background  Vector-borne pathogens are emerging concerns in multiple regions of Canada. Determining regional prevalence of canine vector-borne pathogens and documenting change will improve clinician awareness, enable targeted prevention, enhance diagnosis and ideally reduce the risk of disease. Study objectives were to: (i) estimate the prevalence of positive canine vector-borne test results from samples submitted in Canada; (ii) assess change in prevalence over time, from baseline (2008) to 2015; and (iii) estimate the prevalence of pathogen co-infections.    Methods  This repeat cross-sectional study evaluated 753,468 test results for  D. immitis  antigen and  B. burgdorferi ,  Ehrlichia canis/ewingii/muris  serology, and 753,208 test results for  Anaplasma phagocytophilum/platys  serology using the SNAP® 4Dx®Test and SNAP 4Dx® Plus Test.    Results  Based on all submitted samples from Canada (2008–2015), the period seroprevalence of  B. burgdorferi ,  Ehrlichia  spp.,  Anaplasma  spp. and  D. immitis  antigen were 2.0%, 0.5%, 0.4% and 0.2%, respectively. Over the 7 years (2008 compared to 2015) we observed a significant increase in seroprevalence for  B. burgdorferi  (144.4%) and  Ehrlichia  spp. (150%). Co-infections (positive for two or more pathogens on a single 4 pathogen test kit) were estimated at 5.4% (1162/21,612) of total positive tests.    Conclusions  The temporal rise and geographical differences in prevalence detected for these pathogens (notably  B. burgdorferi ) are consistent with anecdotal information on canine illness related to tick-borne pathogen exposure in multiple regions of Canada, particularly canine Lyme disease.    Electronic supplementary material  The online version of this article (10.1186/s13071-019-3299-9) contains supplementary material, which is available to authorized users.

parasites and vectors

Prevalence of Borrelia burgdorferi, Anaplasma spp., Ehrlichia spp. and Dirofilaria immitis in Canadian dogs, 2008 to 2015: a repeat cross-sectional study