POLICE are trying to track down a killer dog that mauled a sheep to death and seriously injured one other.

The ewe, which was expecting twins, was fatally attacked at about 4.15pm on Saturday near Dorchester-on-Thames.

The dog is described as small and brown, and police believe it was called Willow.

UPDATE: Police release description of dog walker after sheep attack

TVP South Oxon and Vale of White Horse posted on its Facebook page yesterday: "Didcot and Wallingford neighbourhood officers are investigating a dog attacking sheep in the Dyke Hills, Dorchester-on-Thames area.

"One ewe, pregnant with twins, died as result. Another was seriously injured.

"We suspect the dogs name is Willow; described as a small brown dog.

"We would like to remind walkers of the importance of having your dogs on a lead whilst walking near livestock particularly around this time of year."

It is the second time a dog has attacked a sheep in the area this year.

In January a sheep at the Earth Trust Farm in Little Wittenham - next to Dorchester - needed stitches following an attack. 

READ AGAIN: Pictures reveal the extent of latest dog attack on sheep - WARNING GRAPHIC CONTENT

At the time, the Earth Trust urged dog owners to keep their pets on a lead when walking around farmland. 

In 2016, six sheep drowned after being chased into the River Thames by a loose dog in Church Meadow, Wittenham Clumps.

Anyone with information about the latest incident can call 101 using crime reference number 43190065722.