Changing the push notification sounds

Maybe this has been covered, but I'm wanting to change the standard alert sound that I get when someone approaches my door, to something distinguishable. i.e. I don't want it to be the same sound as a text message. Two reasons why: First, if I'm on the road, I'll often ignore a standard text message until it's safe to view the message. With the alert being the same for simplysafe, as my normal text messages, I'd like for there to be a way to tell the difference when I'm driving. Second: My dog is very smart. He knows I get a text when someone is approaching the door, and barks like crazy, just because of the text. That's fine if there's someone at the door, but he now barks every time I get any text message. I'm sure he'll quickly learn the new sound, but still, it's annoying.
Does anyone know if this can be done?