Mr Agnew said uncontrolled dogs posed a significant threat to vulnerable wildlife such as penguins, seals and sea lions, so DoC took incidents such as this one very seriously.
"It is very important for dog owners to act responsibly when exercising their pets in areas where these species occur."
In Dunedin, the self-proclaimed wildlife capital of New Zealand, vulnerable wildlife could be present anywhere along the coast, so dog owners needed to be vigilant, he said.
DoC had investigated two or three incidents involving dogs and wildlife in the past 12 months. Diversion was offered only case by case.