Ok, but what else could it be?
Or a feral cat: https://www.abc.net.au/news/2019-10-15/feral-cat-caught-on-c...
Feral cats are capable of killing pademelons: https://www.abc.net.au/news/2015-03-30/scientists-catch-a-fe...
And feral cats can grow to be quite large and feisty: https://www.abc.net.au/news/2018-06-07/truckie-saves-pet-fer...