No, it's not today, although it could be. Pet Sitter International promote this day.
The idea behind Take Your Dog To Work Day® is simple—encourage businesses to devote one special day to dogs and their owners as a means of spreading the word about what great companions dogs truly make.
http://www.petsit.com/dogday/
So, persuade your work to pick a day every year and people bring in their dogs. I have visited workplaces where people can bring their dogs and it changes the whole work environment, as you can imagine. Not so much work gets done when you do it the first time but morale is great!
Of course, you need to plan out a number of logistical items such as where poop and scoop is allowed, drinking stations if it's summer, and what to do if your cubicle neighbor is allergic to dogs, but I'm sure all that can be worked out if you want it badly enough.
Let me know if you set up one of these days - pictures are great too!
Thanks to my friend, The Infoman, for the tip.

