''Obviously this is very upsetting for everyone involved and our sympathies are with the dog's owners.
''While the dog's owner has asked to remain anonymous and acknowledges taking their dog into the restricted area, this unfortunate incident demonstrates the importance of keeping animals away from operational areas and following the instructions on warning signs.''
The death follows a 8600ha 1080 drop last week which spanned popular dog-walking spots from Whare Flat to Waitati.
A post discussing the dog's death on Facebook page Dunedin Dogs Run Free was shared about 100 times and attracted about 100 comments, many criticising the use of 1080 as a pest eradication method.
An investigation had been launched by Ospri and the operator had already confirmed the dog was inside the area of the Silver Peaks covered by the 1080 aerial drop, and a sign warning people not to walk their dogs there was visible at the only vehicle entry point.
Ospri would add further signs to reduce the chances of another dog dying.
An Ospri spokesman said the ''unfortunate incident'' demonstrated the importance of keeping animals away from areas treated by 1080.
Ospri had worked with the council to ensure all registered dog owners were aware that the area would be out of bounds to dogs for the next 12 months.
margot.taylor@odt.co.nz