A man seen tossing a pooch against a fence and punching it in the head in a brew garden is being looked for by the police.
CCTV film indicates how the enormous dark canine was grabbed by the throat, hit and later hauled away along the street.
It occurred at the Buffalo Bar, off Holdenhurst Road in Bournemouth.
PC Emily Watkins, of Dorset Police, stated: “The footage of this incident is very disturbing and we have made attempts to identify this man, however, these have so far been unsuccessful.
“I am now issuing an image of the suspect in the hope that someone may recognize him.”
Anyone with information is asked to contact the force.