He said she was left shaken and afraid after the incident.
Neighbours, who are regular customers of the dairy, saw the shopkeeper chasing the women and helped to restrain one of them.
Police say they are now looking for the second woman, described as Polynesian, about 20, with dark brown hair, who ran away with more than $200 of cash and cigarettes.
The store was also robbed two years ago, and it left the couple - who are both aged over 50 and moved to New Zealand from China 10 years ago - feeling vulnerable.
"We never feel really safe in this isolated place, we have to rely on our luck not to get killed or injured and nothing can really be done about it.
"We have had one of these incidents before and this time she fought back really strongly."
St John Ambulance staff treated the shopkeeper for her facial injuries.