K-9 Veterans Day Today we honor all the working dogs who have served our country: past, present, and future. National K-9 Veterans Day is a day to recognize and say thank you to all dogs that protect and serve. March 13th is National K-9 Veterans Day. Why is it celebrated on this day? March 13th is the official birthday of the US Army K-9 Corps, formed in 1942. Dogs truly are a special animal and deserve nothing but respect from all of us. Take some time and thank a fellow K-9 today. Today, we salute you!