Sheep grazing at a nature reserve have been attacked by an out-of-control dog.
The incident took place at Alpine Meadow Nature Reserve in Berkhamsted and left the sheep with severe injuries.
As a result the site owners, the Herts and Middlesex Wildlife Trust, say it has left their conservation grazing programme in question.
Paul Thrush, the trust’s senior reserves officer, said: “Attacks like this are tremendously concerning from an animal welfare perspective, and it’s also having an impact on how we manage our reserves.
Anyone who sees a dog worrying sheep should report it to the police on 101.