You might be the type of person who loves taking photos of your dog – but did you ever stop to think about whether or not your dog wants to take a photo of *you*? Think about it: You share plenty of memorable moments with your pup, and during most of those moments, they’re pretty excited. What if there were a way to capture their excitement level with a photo? Enter the new “Heartography” heart monitor and photo camera system by Nikon, which automatically snaps photos whenever a dog’s heart rate goes up. The system is worn around a dog’s neck, and when the dog is excited (or afraid), it takes a photo. The idea is pretty genius, and Nikon tried it out on one dog, Grizzler, to see how it would work. Check out the resulting photos and promotional video below.