A large black labrador-sized animal was seen near Arthingworth.
It was spotted from about 40 metres away through a low-powered telescope on Wednesday, May 2.
The report, made to the Big Cats in Britain group, described the animal as black with white patches on the front.
It was definitely not a dog, said the report.
The incident is the latest in a series of sightings of ‘black beasts’ stalking the Harborough countryside which go back as far as the 1990s.
These include sightings at Arthingworth, Kibworth, East Farndon and in Harborough.We blogged about a sighting of the Black Beast in Foxton at the start of the year. More, as ever, on Rutland & Leicestershire Panther Watch.