Boo's Big Vacation in San Francisco

Boo hits the West Coast with his new book.
3:00 | 08/13/12

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Transcript for Boo's Big Vacation in San Francisco
The world's cutest dog took times square by storm when he was here with us recently. There he is. Now the pup is hitting the west coast in his new book. To show you how popular he is. Becky worley went out to play with the adorable dog. Take a look. Can't keep up with this dog. ♪ weight, 9 pounds. Age, 6 year, internet celebrity. Master of cute. I seen you on youtube. Aren't you the cutest dog in the world? Oh, my goodness. Look at the face. Boo is a pomeranian with a hair cut. One that has everyone reaching out, even if some are not sure what he is. Is that a panda? A panda? He's not a panda but you're awfully cute. You were on boo's facebook page this morning? She's not alone. Boo's facebook page has almost 5 million fans. This superstar even does product endorsements and his own look-alike line of gund toys. You're so cuter. Reporter: And even has international pupparrazzi. You're looking at the new definition of celebrity. Simple, mass appeal and master of social media. Oh, look. It's you. Boo has two books out. This day, he gave out autographs. A real dog, not a statue. Reporter: His second book just published is a tour of san francisco, the historic houses. Over here, over here. Reporter: The table cars. Okay, boo. Where to neck? Reporter: Gir dehirardelli square an the golden gate pinch. The day touring this city with the world's cutest and most popular pooch -- I feel like I'm hanging out with brangelina. This dog is a megaceleb. Reporter: I give in to the pure, warm fuzzy that this cuddly celebrity evoked. It's still foggy, you can take these off. There you are. The cuteness. Reporter: For "good morning america," beck y worley, abc news, san francisco. I can't get enough of boo. If you can't either, you can see more photos of the world's cutest dog at goodmorningamerica.Com on

This transcript has been automatically generated and may not be 100% accurate.

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