160 sheep have been stolen near Wareham.
The animals disappeared between 8am on Saturday 2 November and 2.30pm on 4 November from a field next to the A352 between Wool and East Stoke.
Police Constable Adam Taylor, of Wareham police, said: “The thieves would have needed a good understanding of livestock and used a large vehicle, possibly a six or eight wheeler type lorry, to move the sheep.
“I am appealing to witnesses and anyone who may have seen any unusual activity in the area around this time.
“All the sheep had colour markings and were electronically tagged. If anyone has been offered sheep in unusual circumstances or for very low prices please contact the police on 101.”
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 04:303. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone tariffs may apply.