Lizards aren't venomous? Since when?

Today, while I was folding laundry, I heard a very distinctive bark from outside. It was Dumbarse Dog being protective.
So, I walk out there, and she keeps moving to right in front of me, barking at the base of a tree. It seems we have a resident Blue Tongue that DD thinks she needs to protect us from.

I've seen this lizard a few times now, and as you can see, it's moulting.

I'm just hoping the poor lizard doesn't make a meal for DD, though I'm glad she's decided to just bark and snap at it, rather than try and bite and attack it. It bodes well for when the snakes start.

The Dumbarse Dog - an introduction

We have a 6 month old Australian Kelpie pup, and to be honest, sometimes, she's a real dumbarse.
Take today, for an example.
I'm sick in bed with a migraine, and I get woken up by her barking. Barking at something there.
I drag myself out of bed to look, and find her barking at a blue tongue (For those playing at home, this one was about 40cm long, so a decent sized one, and had pinkish patches on its back. And yes, it definitely had the tell tale blue tongue, since it flicked at Dumbarse Dog).
My problem isn't that she knew to bark at it. My problem is she kept trying to attack it. I presume she'll behave the exact same way when snake season officially hits, then we'll have her in the vets after being bit by a black snake.