Dog owners are being warned to keep their pets under control in the countryside - as the cost of insurance claims for livestock worrying hits a record high.

New figures released by rural insurer NFU Mutual show that the cost of dog attacks on livestock has risen by nearly 50 per cent across the UK in 2016.

Between January and April, when pregnant ewes and lambs are often grazing on low-lying pasture in areas more accessible to walkers, the cost of claims more then doubled.

With many families expected to visit the countryside during half-term and the Easter holidays, NFU Mutual is urging people to keep their dogs on a lead at all times - and reminding owners that farmers have the right to shoot dogs caught chasing livestock.

Tim Price, rural affairs specialist at NFU Mutual, said: "It's not just big, aggressive-looking dogs that attack livestock - well-behaved family pets can worry sheep or cattle.

"Once a dog has attacked livestock, there is a high probability that it will strike again.

"Dog owners need to be especially careful at this time of year when they're out for their usual walk, as there may be a flock of sheep on their route, which wasn't there yesterday.

"We are sadly all to aware of the heartbreak and huge financial loss that dog attacks cause.

"Unfortunately, not all farmers are insured and they can face substantial costs if they lose a number of animals.

"For small and hobby famers in particular, livestock worrying is devastating.

"While insurance can cover the cost of replacing stock killed and the treatment of injured animals, the stress of worrying can cause ewes to abort their lambs.

"This leads to a knock-on effect on breeding programmes that can take years to overcome.

"The number of incidents reported to us is a small fraction of the total, which we estimate cost the industry £1.4 million last year.

"We are seeing higher individual costs of claims resulting from worrying, which may be due to an increase in numbers of some pedigree and rare breed sheep."