Influenza A is a zoonotic disease that affects dogs. In this work, we performed a meta-analysis of the prevalence and seroprevalence of reports from all over the world. We found a combined seroprevalence of 7.6% for subtype H3N8, 7.44% for subtype H3N2, and 3.10% for subtype H1N1. Prevalence values were 0.395% for subtype H3N8 and 17.8% for subtype H3N2. The studies that evaluated seroprevalence in the H3N2 and H1N1 subtypes showed no publication bias, while the H3N8 subtype showed bias in one test and not in another. Dogs, as carriers of influenza A, are in direct contact with humans, pigs, equines, and birds; however, so far it is unknown whether they can function as a reservoir of the influenza A virus, so more studies are needed, with larger sample sizes and a wider distribution throughout the world. Knowing the prevalence and seroprevalence values in dogs is important in the creation of surveillance systems that allow the prevention of outbreaks.