The rogue croc was trapped at Daly River community, 139 miles south of Darwin.
Community police officer Mark Casey said: “Crocs are an ever-present danger but you don’t see them,” he said.
“They can sit for days on end on the other side of the river and watch you go fishing off the same log or rock – that’s how they hunt.
“Next thing you know, bang, the dog’s gone.”
As the saltwater crocodile started getting more brazen near the settlement of 500 people, a decision was made to catch it.
While the pet-eating beast was caught, Casey said there were two more big crocs and a small one still on the loose in the area.
Caught crocs are usually relocated to wildlife parks.