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A pensioner who was walking his dog was attacked by another dog walker and has been left with a fractured collar bone and facial injuries.
The man, in his 70s, was injured in the attack on parkland near Margaret Road, Penwortham, at about 17:00 BST on Tuesday, Lancashire Police said.
The force has released an image of a man detectives would like to speak to, who was wearing a distinctive yellow t-shirt and walking a very small dog off the lead.
Officers said he was aged between 30 and 40, about 6ft 2ins (1.8m) tall and had a large build.
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