Puhleeze! That dog was paper trained!
From a Washington Examiner article:
“Early during President Obama’s first term, the top agents charged with protecting the president and his family on the Presidential Protective Division were concerned about Secret Service dogs attacking Bo, Obama’s first Portuguese Water dog and beloved pet, a source said.”
http://www.washingtonexaminer.com/article/2617925/
http://www.freerepublic.com/focus/f-news/3536637/posts