The dog was secured on a chain in the family's yard at the time of the attack.
Police have confirmed the dog was a pit bull and has been taken by animal control who are working with the family.
EARLIER 11.49am: A toddler bit on the face in a dog attack at Matapihi this morning required doctor's treatment for lacerations to his face but was not "seriously" hurt.
The 3-year-old was at a Waikari Road property at 8.40am when he suffered injuries to his face from a dog, initially reported to be a pit bull.
St John ambulance staff took the boy to Tauranga Hospital, where hospital spokesman said the boy was now "comfortable".
St John team leader Ross Clarke said the child was not considered to be seriously hurt but required doctor's treatment for lacerations to the face.
Police northern communications Inspector Andy Brill said police received a call from ambulance staff for assistance at the scene and officers were responding.
The dog believed to be responsible for the attack has now been removed from the property.
The boy was taken to Tauranga Hospital where a hospital spokesman said the boy was now "comfortable".
Occupants of the Waikari Rd property where the attack happened declined to comment.
Animal control officers were still investigating the incident.