I hunt several properties near Houston, Bay City and Palacios that are loaded with gators. Luckily we've never lost a dog to one yet, but I know of several that have.
I don't think there's anything you can do to help your dog if one grabs it.
I did have a dog lay on a gator once. It was hot and we came up to creek to cool the dogs off, my dog ran into the water and plopped down on her belly. About that time, the water exploded underneath her... she went one way and the the gator went the other way.
