Barksnap - the dog whistle camera app.
Point camera at your dog.
First, point your camera at your unsuspecting pup.
Press and hold to whistle.
Press and hold the blue button at the bottom of the screen. The app will emit a high pitch dog whistle, which should get your pup's attention!
Release to snap picture.
When your dog eventually looks over, release your finger to snap the picture. Share with friends!