Not saying the couple was right for parking where they did and leaving the dog tied to the tree but when you have a dog, baby and luggage coming from two separate flights, I could expect it was probably a little overwhelming. Maybe baby was fussy, dog had to pee. I don't think the couple was acting as if they were "above the rules" like a few commented. I've done it before..."wait here, I'll go run in and if security comes by, just explain the situation". I'm totally guilty of that. What I wouldn't expect is a security officer approaching in an agressive manner. Simply saying they needed to move ASAP would've been enough. Dogs can sense harm and pit bulls are known to protect their family at all costs. The dog did exactly that and the officer did what I guess he thought he had to. Until there is hard evidence like video, we may never know. Unfortunate all the way around.