I can't find a reference online, but I have a book called The Mystery Animals of Ireland by Gary Cunningham & Ronan Coghlan which has a lot of info on Lough monsters among other things.
One such weird creature was seen by Louise Donnan and her niece Clare as they were driving near Kilkeel, County Down. They noticed what looked like a very large sheep lying by the side of the road and they slowed down as they passed to get a good look at it.
When it turned to look at them, "We both gagged in disbelief and revulsion", said Louise. It's coat resembled not wool, but torn rags. It then charged at the car, pushing it's face against the window showing one terrible, red eye which they say emitted a feeling of pure, wild evil.
They sped off, but the creature was able to keep up with the car for some time, ramming into it as if trying to push them off the road, before it gave up. They were quite shaken as they watched it in the rear view mirror.
They refer to it throughout as an 'animal' in inverted commas and are adamant it was neither a dog or a sheep. Also, sadly there is no date given for this story. There is an artists impression however, and I can assure you it does look nasty.
Edit to add:
(Was this story from Ireland? It might ring a bell with someone - People driving at night on a rural road have their path blocked by a horse like creature, but when it turns towards them, they see it has the face of a twisted, malignant Human Being.)