National Dog Day is celebrated annually on August 26. This date was chosen because it is the day the founder, Colleen Paige, adopted her first dog when she was 10 years old. National Dog Day honors dogs of all breeds and sizes and promotes dog adoption and awareness about the value of dogs in our lives.

Additionally, there is also National Rescue Dog Day, which falls on May 20 each year, specifically focusing on rescue dogs and encouraging their adoption from shelters.

To summarize:

• National Dog Day: August 26 every year
• National Rescue Dog Day: May 20 every year

For the year 2025, National Dog Day will be on Monday, August 26.