The issue of the decomposing carcase of a dead horse in a tributary just off the River Swilly is understood to have been raised with the Office of Public Works by Donegal County Council.
The OPW are responsible for the waterways and as of yesterday evening the animal remains were visible from the Neil T Blaney Road, in the stream between Bonar Engineering and the New Aldi store.
A spokeman for Letterkenny Town Council said the matter has been raised with the County Council who have raise the issue with the OPW.
The full size animal was spotted in the river towards the end of last week.
It is not known if anyone has come forward to claim the carcase but animal welfare groups have expressed concern that the authorities have left the animal rotting all week.
One source, who did not wish to be named, said not only did the animal pose a health threat but it was unsightly and not a great advertisement for the town.
“It’s hard to believe the authorities have left this animal lying here all week. The good weather has ensured it’s decaying and the smell is terrible. No one seems to know who owned the animal but you can’t help feeling it might be a victim of the recession - too costly to feed. It’s hoped this doesn’t become a trend.
“We’ve heard of other animals been abandoned such as the wee donkeys in Fanad. Someone should be held accountable for it,” the person said.