First dog Bo is a "kind of crazy" puppy who likes to chew on people's feet, Michelle Obama told children visiting the White House on Thursday.
The first lady is spending a lot of time walking and training the 6-month-old Portuguese water dog who became a member of the president's family last week.
An energetic breed, Bo plays well into the night, as he did on Wednesday.
"It was like 10 o'clock. Everybody was asleep and we hear all this barking and jumping around," Mrs. Obama said. "The president and I came out and we thought somebody was out there. And it was just Bo. He was playing with his ball. And it was like there was another person in the house.
"He's kind of crazy, but he's still a puppy. So he likes to play a lot," she said.
The dog, unveiled last week after months of speculation, was a gift to Obama daughters Malia and Sasha.
"He loves to chew on people's feet," Mrs. Obama divulged to more than 100 children invited to a program marking the annual Take Your Child to Work Day.