Your pet is doing that thing again. It's the cutest thing ever, and it must be snapped, shared and forever immortalized on social media. Cats and Dogs of Instagram, here we come. But what happens? Just as you reach for the camera to compose the perfect shot, your subject bolts. The moment is gone forever, as are your dreams of Instagram stardom. We get it. Taking memorable photos of your pets is challenging. But it's not impossible. Here are some tips.