North Yorkshire Police is warning dog owners to keep their animals on a lead near livestock, or face prosecution.
The police's rural task force is seeing increased reports of sheep worrying across the county resulting in the death or serious injury of livestock.
A police spokesman said: "Last week a farm in Wigginton near York reported the killing of two pregnant ewes and another three pregnant ewes the week before. All of these sheep were in the same field that has a public footpath along the edge.
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