An 'out of control' Rottweiler is seen chasing and barking at horses in Oxford.
The incident was recorded by Tracy Smith, 40, an experienced horse rider.
She says dog owners need to be educated more on safety around bigger animals.
Dogs should be kept on leads and in ear shot of owners when a horse is nearby.
A mum in Oxford has revealed terrifying footage of an 'out of control' Rottweiler chasing her teenage daughter's horse for more than three minutes.
Tracy Smith's daughter, Ella, 14, clung on in fear when the large dog repeatedly darted at her horse, barking as it chased them in circles near their home on August, 12.