Police are appealing for the owner of a dog who attacked sheep in a field in Clothalls Farm, West Grinstead near to the A24 early on Thursday morning (Nov 4) to come forward.
Three sheep have died while a further nine have bite injuries, some of which are thought to be fatal.
The farmer found their sheep scattered and scared and they are now being treated for shock and injuries.
Police are urging people to keep their dogs on leads when they're in the vicinity of livestock.
Anyone with information is asked to report it online or call 101 quoting serial number 821 of 04/11.