An elderly man was allegedly punched in the face and knocked to the ground at a Lincoln pub in an unprovoked attack.
Officers were called to The Morning Star in Greetwell Gate on November 10 to reports that a man in his 80s had been assaulted.
As part of a police investigation, CCTV images have been released of a man police are looking to speak to.
The attacker was described as being clean shaven and of an average build. The man was wearing a baseball cap and casual clothing at the time.
He also had a dog with him, described as a dark coloured greyhound with a tattoo on its ear.
Anyone with information about the incident is being urged to contact Lincolnshire Police on 101, quoting incident 380 of November 10.