"Dog owners whose dogs attack seals are committing an offence, as the Dog Control Act requires them to keep their dogs under control at all times.
"Seals are protected under the Wildlife Act 1953 and owners of dogs that attack seals could face some hefty penalties.
"In this attack the dog owner did the responsible thing. He came forward and identified himself to DoC and we are thankful for that and are working with him to resolve the matter."
DoC ranger Rod Hansen said owners could face charges of $1200-$3000 for dog attacks on seals.
DoC could also take court action if necessary.
DoC takes a "hands off" approach to kekeno because they are capable, resilient and, when given time and space, usually find their way home.
They often just come ashore to rest.
However, rangers will intervene if the kekeno is in immediate danger, for example getting tangled in debris, causing disruption or being harassed by people or dogs.
It is an offence under the Marine Mammals Protection Act 1978 to disturb, harass, harm, injure or kill a seal.
A dog owner whose dog attacks a seal can face prosecution.
Members of the public can help by ensuring their dog is under control, and on a lead at all times.
Kekeno were once hunted from the northern to the southern tips of New Zealand for their pelts, bringing them to the verge of extinction.
Since being protected, the seal population has increased and they are spreading further north. Sightings are becoming more common on the East Coast.