The dog owner admitted killing the seal so he could feed it to his chickens, the summary of facts stated.
Davan, who is in custody on other matters, is due be sentenced later this month.
The Dog Control Act makes it an offence to be the owner of a dog that attacks protected wildlife. It requires dog owners to take all reasonable steps to ensure their dogs do not attack wildlife and to take extra care in areas that provide sanctuary to protected animals.
In this case the dogs, though registered, were not under the owner's control, the summary of facts said.
The Far North District Council also sought a court order allowing the dogs to be destroyed. It was granted and the dogs were put down shortly afterwards.
The prosecution was taken by the Far North District Council and the Department of Conservation. DoC had not responded to Advocate enquiries by edition time yesterday.
The New Zealand fur seal was pushed to the brink of extinction by sealing in the 1700s and 1800s but has been fully protected by the Marine Mammals Protection Act since 1978. Its numbers are now increasing.
Newly weaned pups, aged 9 or 10 months, often come ashore in winter and hang around on Northland beaches or in harbours while they learn to survive on their own. They may also seek out land for a respite from storms at sea.
The Ahipara case comes as an Otago man faces charges of stabbing a sea lion pup to death and attempting to pervert the course of justice. The pup was found dead near Quarantine Pt in Otago Harbour in November.
The New Zealand sea lion is one of the world's rarest seal species and is classed as nationally critical. The dead pup was one of just 11 born on Otago Peninsula last year.