Today marks the fourth anniversary of Hurricane Katrina. Those of us who lost so much on that day find it difficult to put our feelings into words. Filmmaker Tom McPhee gives voice to our turbulent thoughts and emotions with his moving documentary, "An American Opera: The Greatest Pet Rescue Ever."  He estimates that half of the flood's victims chose to stay because of their pets. As someone who had the means to evacuate her four dogs and two cats, I can understand why many people risked their lives rather than leave their furry family members behind. You can see this film as part of the nationwide Rescue Party Tour  (each screening benefits local animal charities) or purchase the DVD once the tour is over. It's an educational and inspiring look at the good that can come out of tragedy when people work together for animals.