K9 Veterans Day is a day to honor and commemorate the service and sacrifices of military and working dogs who have served in various capacities alongside their human handlers in the armed forces and is also an opportunity to show appreciation to their handlers, trainers, and caregivers who work tirelessly to ensure their well-being.K9 Veterans Day is observed on March 13th every year and serves as a reminder of the important role that dogs have played and continue to play in the military, as well as to recognize the bravery, loyalty, and dedication of these remarkable animals. It is also an opportunity to show appreciation to their handlers, trainers, and caregivers who work tirelessly to ensure their well-being. K9 Veterans Day was first observed in 1942, when the US Army began training dogs for use in World War II.