The incident happened between 6.30pm and 7pm on Wednesday 16 October when two men approached the victim as he was walking his dog across fields near the cricket club on Caverswall Road, near its junction with Holyhead Crescent, in Weston Coyney.
One of the men assaulted the victim, a 63-year-old Stoke-on-Trent man, causing him head/facial injuries and the blow resulted in him falling to the floor.
His dog began barking at the men and they were last seen running towards Caverswall traffic lights.
They both wore dark-coloured hooded tops.
The victim made his way home where he alerted emergency services and was taken to the University Hospital of North Staffordshire for treatment.
He was discharged the next day and is now recovering at home.
DC Mark Brereton, investigating officer, said: “This was a nasty unprovoked attack in a fairly secluded area but the men were seen running towards the housing estate so we want to hear from anyone who may have seen them in the area.
“Fortunately, the victim is now out of hospital. However, he has been left extremely shaken.”
Anyone with information, or who saw anyone matching this description in the area, is asked to contact DC Brereton at Staffordshire Police on 101, quoting incident number 606 of October 16.
Alternatively, they can contact independent charity Crimestoppers, anonymously, on 0800 555 111.