Actually, the day is not altogether whimsical. It does have a serious purpose which is to call attention to the abuse of dogs through "puppy mills" which produce puppies for profit only, with no regard for the health of the animals or for the betterment of the breed.
In honor of the day, Huffington Post has put together a mashup of cute puppy videos called "When puppies attack." Just click on the link to enjoy. The article which contains the video also has a whole bunch of adorable puppy pictures in a slide show.
If all of that gives you saccharin overload, then here's a Grumpy Cat antidote.
Take good care of the animals that depend on you, whether you are a cat person or a dog person. Or even a hamster person!
Photo by Andrea Zampatti, courtesy of Huffington Post