The Lincolnshire Wildlife Trust is asking for help tracking down a missing sheep in the Woodhall Spa area.
It follows an alleged dog attack on a flock of sheep at Moor Farm Nature Reserve earlier today (Tuesday).
One of the sheep ran off in the direction of Woodhall Spa.
It is black Hebridien sheep and members of the public are asked not to approach it.
Instead, they should contact the Wildlife Trust on 01507 526667 with any information.