A farmer is urging dog walkers to keep their pets on leads after three of his sheep, 10 chickens and five ducks were killed in attacks over three days.
Tom Ducker, aged 24, who runs Coppice House Farm at Rivelin Valley, found three sheep dead on his land over three consecutive days, as well as 10 dead chickens and five ducks.
He said he fears the dog responsible will now have a taste of blood, and could return if its owner is walking it off its lead.
Another of his theories is that a local dog owner, allowing his or her pet out into the garden at night, does not realise it is getting out and worrying livestock.
Tom, who also runs Duck House Farm Shop, said he is very disappointed by the loss of his sheep and poultry.
“I found the first dead sheep on Sunday, the second on Monday and the third on Wednesday, as well as 10 dead chickens and five dead ducks,” he said.
“A fourth sheep was also attacked over the same period and was badly bitten but we managed to revive it.”
He said he believes a dog is responsible rather than a fox.
“I assume it is a dog that has a taste for blood rather than a fox, because to have got the sheep around their necks would have taken some strength,” he said.
“All I can think is that somebody is walking their dog in the same area day after day, and letting it off its lead, leaving it free to worry the sheep.
“The other possibility is that somebody is letting their dog out at night into the garden before bed, and not realising it is getting out.
“I want to make people aware that this is happening because this is my livelihood.
“If the dog concerned has a taste for blood now, it is going to keep coming back.
“If anyone knows or suspects who this could be I would urge them to come forward so we can try to put a stop to it before I lose any more animals.”
Tom has also highlighted the sheep worrying incidents on Twitter.