Boo is now the star of the book, "Boo: The Life of the World's Cutest Dog," which takes fans inside his adorable canine world. "Good Morning America" asked Facebook fans to send in the best caption for these photos of Boo. Without further ado, here are some of our favorites. <br><P>"Sergeant Boo, reporting for Duty" -- Evan Haggerty<br><P>"Now you see me, now you don't!" -- Jill Brummer Wolf

"Hey! My face won't fit in there!" – From Robin Kabrich<br><P> "Excuse me.....this is not what I ordered!!" -- From Carol Ross Shearer<br><P>

"This bath only has room for one cute thing..." – From Mary K Valentine<br><P> "I wonder what rubber duck taste like?" – From Patty Paschal Ceran<br><P>

"Peek a.......BOO! :))" – From Christy Baker<br><P> "Mirror, Mirror on the wall, who's the Boo-ti-fulest dog of all? – From Linda Puckett<br><P> "You lookin at me! Are you lookin at me!" – From Debbie Lee<br><P> "I really need to shave." – From Julie Meredith<br><P> "Ya think I need Boo-tox?" – From Rhonda Marlow Rigsbee <br><P>

"The cat did it!" – From Babette Buensuceso<br><P> "This looked so easy on the commercial" – From Pat Sawyer<br><P>

"Enough with the pictures already, I'm tired." – From Michael J. Bisbano<br><P> ?"No pictures, please.....paw-parazzi!" – From Elaine White<br><P> "Wake me up so I don't miss GMA!" – From Linda Recore<br><P>