Hello, my name is Kevin & I'm from Adelaide! This is my 1st post here. My wife & I travel quite a bit to the more remote areas of Aust & the rules we follow are very simple; we always camp with other campers, never alone. We also never camp in free roadside camping grounds unless there are grey nomads/families already present, nor travel after dark if it can be avoided. That way we gain security by having other like minded people around us & we don't hit any cows or kangaroos that run unexpectedly onto the road in front of us at night.
To keep snakes out, simply keep your tent/annexe zipped up at all times & if you're using a sleeping bag, don't unroll it until you're going to use it. We've camped in some pretty remote places & done a lot of walking there too......... snakes just haven't been a problem! Could count the ones we've encountered on one hand & they all just slithered away!
We've slept in a tent while dingoes/wild dogs were howling outside & we've never had a problem with them. Just remember to fold your camp chairs up, or the dogs may use them as a bed! Keep food locked away too! The only things that scare the crap out of me (us!) are salt water crocodiles & they're only found in the tropics! I won't camp anywhere near water in the tropics except the Kimberley, as there are only fresh water crocs there & I'm not on their menu lol!