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The man's rescuers obtained contact details for the dog's owners and their vehicle registration.
He was taken to Bay of Islands Hospital in Kawakawa where he received 14 stitches and a tetanus shot. A chunk of flesh was bitten off in the attack. St John Ambulance and police responded.
The attack has also been reported to Far North District Council animal control, which is investigating.
Environmental services manager Rochelle Deane urged anyone who had witnessed the attack or had seen a dog or dogs off-leash on the trail around 11am on Thursday to contact the council on 0800 920 029.
Under the Pou Herenga Tai-Twin Coast Cycle Trail Bylaw 2016 it was an offence for dogs to be off-leash on the cycle trail. That was clearly signposted, she said.
Breaking the bylaw can attract a fine of up to $20,000.
The Twin Coast Cycle Trail stretches 86km from Ōpua to Horeke in South Hokianga.