If you cross into Western Australia, from the Northern Territory, you may hear about Nifty the Cane Toad sniffer dog. I met Nifty and his handler in 20o9. Some of their work involved public relations, assisting in educating travelers about having not to accidentally bring cane toads into Western Australia from the Northern Territory with them. Obvious things you can do is to wash down your vehicle before driving from a cane toad infected area to one that is less infested, or clear of cane toads.
My Pastel Pencil Canine Portraits