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Police are urging dog owners to be responsible following attacks on sheep ahead of the lambing season.

Officers from North Wales and Dyfed-Powys police forces have tweeted photographs of sheep which have been injured or killed in dog attacks.

A rural crime team has published a montage of distressing pictures.

The caption reads: "This needs no words or music. Just time to reflect on the devastating impact an irresponsible dog owner can have."