A man was punched and kicked in the face after confronting a couple he believed were mistreating a dog.
The 58-year-old had an argument with the man and woman on Grimshaw Street before being punched to the face by the man.
He fell to the floor and was then kicked to the face by the woman.
The offenders made off from the scene towards Avenham and police are trying to track them down for questioning.
PC Corina Barton, of Preston Police, said: “We are asking anybody who recognises them to contact us.
“Similarly we would urge the couple – if they see this appeal – to come forward.
“We would also like to hear from anyone who witnessed the incident and has not yet been spoken to by officers.”
Anybody with information is asked to contact police on 101, quoting log number 1266 of January 27.
The incident happened on January 27 between 9pm and 9.30pm.