I can't see the vid (browser problems), but I posted a thread about this a week ago.
http://www.yorkietalk.com/forums/yor...-your-dog.html
You can use a variety of completely harmless dyes - food coloring, sugarless Koolaid, vegetable dye, or professional dog dye.
There's actually a very inspirational story of a man in Japan who adopted an abused, neglected shelter dog. He dyed him to look like a panda bear, and the dog is now a mascot for the country's shelter dogs.
Other people will dye their dog pink for breast cancer awareness month.
I had been thinking of dyeing Thor for Easter, but he got a tummy bug - coincidence? 4th of July is coming up soon though (evil laugh).