That's a Golden Tree Snake (I believe the best or one of the best flying snakes in the world). They're quite common here. Only mildly venomous to humans (unless one happened to have an allergic reaction). They like to feed on geckos, small lizards and mice, and are actually quite beautiful. It's the cobras and big pythons you really need to worry about. Lost a beautiful young Yellow Lab to a cobra bite about 9 years ago. Really sad but she died protecting us and took the snake out with her.
Sorry you lost your yellow lab.