The man was walking his dog in Beatrice Road, Wisbech, at 10.15am on Thursday (August 8) when another canine attacked the both of them and inflicted injuries to the man’s hand.
His dog needed treatment at a veterinary surgery.
Pc Colin Johnson said: “This was a distressing incident for the victim and his dog.
“We believe several people witnessed the attack and would urge them to call police.”
INFORMATION: Anyone with any information should call PC Colin Johnson on 101 or Crimestoppers, anonymously, on 0800 555111.