While the enquiry was under way he would not comment further, including about what type of dog was involved. The tests also found DNA from a second, as yet unidentified, dog.
Mr Walker said he had also located a dog wandering in the Wharau Rd area on Saturday afternoon. It had been handed to the Far North District Council.
The penalties for allowing a dog to kill wildlife can be severe.
Under Section 58 of the Dog Control Act, the owner of any dog that seriously injures a person or kills protected wildlife can be fined up to $20,000 or jailed for up to three years.
Section 59 states that police or animal control officers can seize and destroy any dog on the loose which is disturbing or threatening protected wildlife.
Five more kiwi have been killed by dogs in the wider Bay of Islands since the Wharau Rd deaths.
The Bay of Islands' worst canine kiwi killings occurred in 1987 when a single dog abandoned in Waitangi Forest killed an estimated 500 kiwi over a six-week period.
- DoC urges anyone who sees a dog or dogs wandering in the Wharau Rd area, or being walked without a lead, to call the hotline on 0800 DOC HOT or the Far North District Council on 0800 920 029 immediately. Both lines are manned 24 hours a day.