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The dog, the much-loved companion of Dunedin Wildlife Hospital co-chairman Andy Cunningham, vanished in late January after being caught up in a car crash.
Despite extensive searches by armies of volunteers there had been no sightings of Meg - until she was spotted on farmland near Purakaunui on Monday afternoon.
Meg has since been treated at the Wildlife Hospital on a daily basis, before being taken home at night.
Mr Cunningham posted on Facebook that the past two days had been spent feeding Meg intravenous antibiotics and fluids as she was badly emaciated and dehydrated when she was found.
''She had lost half her body weight and has infections and ulcerated wounds.''
Both her forelegs were badly damaged and vets were still assessing if they could be saved.
In the meantime, Mr Cunningham had been inundated with offers from well-wishers wanting to donate to Meg's veterinary bills.
''Alison (Cunningham, Mr Cunningham's wife) and I have been overwhelmed by the incredible offers to help pay for Meg's treatment, from so many people,'' he said.
''If you really do want to make a contribution, then we would love it if instead you made a donation to the Wildlife Hospital, which is currently treating her for free as a favour to us.''
The Wildlife Hospital's bank account number is: 12-3150-0161217-00 reference ``Meg''.