A teenage boy suffered injuries to his arm and chest after a man set a dog on him at St Giles Fair, Oxford.
The 17-year-old boy was surrounded by a group of men who assaulted him at 10pm last Tuesday.
He escaped, but was confronted by another man, who set his dog on him. He was treated at John Radcliffe Hospital.
The man with the dog was of mixed race, about 6ft tall, in his mid-20s and had a scruffy beard. He wore a black Adidas jacket with a red collar.
Call Crimestoppers on 0800 555111 or Pc Tim Preen on 08458 505505.
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