"If you're a parent you know what scream I'm talking about. I ran out to see this mutt over my child and not one person from the other houses surrounding even came out, not even the owner of the dog."
The only description of the dog was that it was brown and looked like a pitbull.
Far North District Council animal control officers impounded a dog from a Mawson Ave property yesterday and took statements from its owner and the girl's family.
A spokesman said the council's investigation was likely to take several days.
The woman's post, on the Kerikeri Noticeboard Facebook page, sparked calls for vigilante justice - and concerns from other dog owners on the street that their pets could be targeted.
The attack on the child comes just 10 days after a 94-year-old man was bitten on the legs and arm trying to protect his pet from an attack by an unrestrained dog on sports fields next to Kerikeri Domain.
He was treated in Bay of Islands Hospital and discharged while his dog needed its ear stitched.
The dog, described as a staffordshire terrier cross, has been seized by animal control officers. A decision on its fate has yet to be made.