In Australia you've got your choice of horror stories. The saltwater crocodile, for example, will attack even when unprovoked. The tentacles of the box jellyfish supposedly contain enough poison to kill three adults. Of the world's top 25 venomous snakes, Australia has 21, including sea snakes with venom two to ten times as deadly as a cobra's. The cassowary, a large tropical bird, has a daggerlike forward toe it uses for kicking.
Some cone shells contain a mix of toxins that can cause pain, paralysis, and collapse.
A thousand species of Australian plants are toxic to livestock and humans. And let's not forget skin cancer and Vegemite. Wonder anybody lives to age seven. But you asked about dingoes. Thought to have arrived in Australia 30,000 years ago, the wild dog known as the dingo has long been known for its ferocity and willingness to drag off and eat almost anything, including rabbits, wallabies, and sheep.