Who doesn't love puppies? Every Dawg was a puppy once. If you believe in reincarnation, maybe more than once. Today is a day to show speecial love to your puppy. If you are thinking of getting a canine pet, consider adopting a rescue dog.
It's also National Goof Off Day. Except for essential activities (like your real job) it's a day to postpone such stuff and just...goof off. Do what you wish. Stay in your pajamas if you wish. Sounds like that would be right up Dawg Nation's alley.