Sunny, a female, joins fellow Portuguese Water Dog Bo in the White House.

In honor of Sunny, the Obamas are making a donating to the Washington Humane Society, according to a post on the White House blog announcing the puppy's arrival.

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“Sunny is the perfect little sister for Bo – full of energy and very affectionate – and the First Family picked her name because it fit her cheerful personality,” according to the post, which included photos and a video of the first dogs.

First Lady Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama criticizes lack of diversity in politics: one side is 'all white, all men' Obama interrupts Michelle's appearance with 25th anniversary tribute Michelle Obama: Young people feel what's happening now 'not what they were taught' MORE tweeted her excitement for Sunny's arrival.