The owner of a rest home near Otamatea Reserve says his organisation has never used rat bait because of the danger it would cause pets.
Last week several dogs that had walked at the reserve became unwell and there were concerns unwell rats had been seen drinking from a trough at Otamatea.
The Whanganui District Council said one of the sick dogs was taken to Massey University for tests but it's yet to hear back on the results.
One woman who walked her dogs at Otamatea Reserve was concerned a nearby rest home had possibly laid down rat bait.
The Chronicle understands that concern has been repeated among others in the dog-walking community.