If you have a dog and a camera you most certainly employ those special please-look-a-little-cuter photo op words. "Squirrel" or "birdies" work particularly well for Bella. Especially if uttered in the form of a question.
To get Kate to go from this...
To this...
Just a whispered "who's there?"
Which is funny 'cause she could not care less if someone was actually there or not.