A field of pregnant sheep could abort their lambs after they were chased by a dog which entered a restricted area of a park.
Police were called to Panshanger Park, near Hertford, last week after a dog entered a field which was closed to the public due to it housing pregnant ewes.
The dog chased the pregnant ewes leaving them in distress.
Estates manager Michael Pendock told the Hertfordshire Mercury: “The sheep in that field were pregnant ewes and the distress from being chased by dogs could lead to them aborting their lambs.
"The vast majority of dog owners and walkers keep their animals under control but unfortunately it only takes one irresponsible owner for attacks like this to happen.
“On this occasion the sheep that were attacked are pregnant ewes which makes this incident all the more upsetting.”
Last week, in Scotland, a 49-year-old woman was charged after a sheep was killed in a dog attack on a farm.
And last year an angry dog walker ripped down an FG Take the Lead sign - describing sheep worrying as a ’small problem’.
Farmer Guardian editor Ben Briggs received an anonymous letter with the torn-down sign which was described as ’objectionable and rude’.
It read: "This sort of sign is incompetent and unhelpful. It fosters a deeper gulf between farmers and the majority of other country people and visiting countryside users.
"It is objectionable, rude and overstates a small problem.
"At this time, during Brexit, farmers should be reaching out to country people - not just shouting at them."
"Please ask dog owners to keep their pets under control, rather than ordering them to keep dogs on leads - something farmers have no right to do."
The ’Take the Lead’ campaign has been backed by a wide range of high profile rural groups including the Women’s Food and Farming Union, British Horse Society, Lake District National Park, Countryside Alliance, Farmers Union of Wales, NFU Scotland, NFU and NFU Mutual, The Farming Forum, CLA, Ramblers and the RSPCA.
It aims to raise awareness of livestock worrying and reduce the number of dog attacks.