Footage of a man repeatedly punching a dog has been released by the Royal Society for the Prevention of Cruelty to Animals in a bid for information.
The violent assault on the terrified dog, which is believed to be an American bulldog, was recorded on a street in Lancashire by a member of the public who reported it to the RSCPA.
It happened on Hendon Road in Nelson at around 3.15pm on Thursday 10 December.
The RSPCA have issued an appeal for witnesses who may know the man or the whereabouts of the dog.
RSPCA Inspector Charlotte Booker said the dog was "clearly petrified".
She said: "We hope that the images of him and the dog - a large white bull breed, we think probably an American bulldog - along with the location and time this happened will mean that those who know him will recognise him, and call us.
"This was a sustained attack on a dog which was clearly petrified and submissive and which had to be picked up and carried down the street afterwards.
"Please, if you have any specific information about this man, and where the dog is now, get in touch."
Anyone with information can call the RSPCA's appeal line on 0300 123 8018 and ask to leave a message for Inspector Booker.