This online course will provide an in-depth review of published studies demonstrating that dogs are at risk of various vector-borne infections. You will learn how different diagnostic methods can be used to identify dogs that have been exposed to or infected with more than one pathogen. You will also explore the impact of infection by more than one pathogen on the clinical signs and course of the disease, including two studies investigating the effects of coinfection. The course will conclude with a clinical case example.