I can't whistle. Never have, probably never will.
So when I call our dog, Jasmine, I say, "Here, Jasmine!" and I click my tongue twice (click, click). I'll also sometimes hold out my hand to her. Lillian and Abigail will call here in similar ways, clicking their tongues as well.
Last night, Lillian wanted me to come to the kitchen with her to get her a snack. She called, "Mom!" then I hear, "click, click" as she held out her hand.
I obediently followed her to the kitchen. Good Mom!