Police and ambulance raced to the street at 9:30 this morning.
A neighbour heard her screaming and turned up with his tewhatewha - a Māori club shaped like an axe - to chase them off.
Auckland Council provided their top tips for dealing with an aggressive dog.
It all unfolded on Sunday at the Meola Dog Park in Pt Chevalier.
The two-year-old had hair and chunks of her ear missing after the tragic accident.
A fundraiser has already accumulated $3000 worth of prizes and $500 of donations for vet fees.
"I have never heard anything make a sound like that...she was in so much pain."
A 21-year-old has been arrested.
The infant was taken to Waikato Hospital in a "serious condition".
