Hi Andrew,
Re
og.
Yes, dog works but only if the dog has the inclination to chase possums.
I have a smart Border Collie. Will not chase any wild life except Plovers in flight and then they must be screeching out their call.
We had a Cavalier / Poodle cross that was a serious hunter. Nothing was safe. Its a bit of hit and miss. Terriers like Foxies are generally good.
Cheers