National Lost Dog Awareness Day Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: April 23, 2020 all-day Repeats 2020-04-23T00:00:00-05:00 2020-04-24T00:00:00-05:00 Where: National Lost Dog Awareness Day United States NATIONAL LOST DOG AWARENESS DAY National Lost Dog Awareness Day is observed every April 23rd. This day was created not only to bring awareness to the dogs that go missing but to also celebrate the reunions.