Memo to Hillary Clinton: Any footage of you barking like a dog can and will be used against you. After Secretary Clinton, yes, barked like a dog in February to make a point about the GOP, it was only a matter of time before one of her opponents used the clip out of context.
That time is now, the opponent is (of course) Donald Trump and the medium is an Instagram ad. Barking Hillary is used here to suggest that the former secretary of state is "a joke" who is not taken seriously by the likes of Vladimir Putin and ISIS -- and thus voters should choose non-joke Trump to face down the bad guys.
This story also appears on Adage.com.