A man who hung a dog by the lead and swung it against the wall of a train is being hunted by police.
The hooded man cruelly attacked the Staffordshire Bull Terrier before placing it on a seat and pushing his foot against the dog’s face.
The animal was so scared that it defecated on the train seat, forcing staff to cancel the service from Braintree to Witham, Essex.
They viewed CCTV to work out what had happened and saw the dog being abused.
Officers from the British Transport Police (BTP) have now released CCTV images of the man responsible in a bid to identify him.
The incident is understood to have happened at around 10.30pm on Monday October 10.
BTP Investigating officer Police Sergeant Paul Thompson, said: “This was an unbelievably shocking act of cruelty.
“No animal should ever be subjected to such punishment and I am determined to trace the man responsible.
“Clearly this animal was frightened for its life as he emptied his bowls on the seat and train carriage.
“I’d urge anyone who has any information on who this man is to contact us as soon as possible.”
Anyone with any information is asked to contact BTP on 0800 40 50 40 or Crimestoppers anonymously on 0800 555 111.