by Mike Krumboltz How much would you pay for the dog of your dreams? $100? $500? How about $600... thousand? It may sound insane in the membrane, but a rare dog breed called the Tibetan mastiff is collecting those kinds of kingly sums in China. What's with the crazy prices? "The Today Show" profiled the nation's love of the pooches , and inspired a slew of Web searches along the way. For those who prefer mutts to purebreds, here's a quick explanation of the newest "it" dog.