Meet Gibson and Boo Boo, the tallest and the smallest dog in the world. They just met near the White House, in Washington D.C., to celebrate The Guinness World Records Day.  Gibson, a Great Dane that is 107cm tall was named the tallest dog in the world in 2004. In 2007, Boo Boo took the title for the smallest dog, she is 10.16cm tall and it's a Chihuahua.
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