A partially sighted man and his guide dog were attacked by a Staffordshire bull terrier or mastiff style dog in Newhaven.
Sussex Police are investigating after the 84-year-old man and his dog were set upon by the animal on private land at Iveagh Crescent in Newhaven.
The incident occurred shortly before 11am on Friday January 17.
Police said the man was bitten on the hand and needed treatment at the Royal Sussex County Hospital in Brighton.
The owner of the dog is believed to be a white man, 5ft9, with short, untidy hair, wearing a dark blue hoodie and grey tracksuit bottoms with a stripe on each leg, and black plimsolls.
Anyone who saw what happened or the dog’s owner is asked to phone Sussex Police on the non emergency number 101 or email email@example.com, quoting serial 563 of 17/1.
This follows another dog attack which took place in Newhaven in October where a woman required hospital treatment after a pitbull style dog attacked her and her own dog at Lewes Road Recreation Ground.
The woman was walking her dog at around 5.50pm on Sunday, October 6, when they were attacked by a ginger/brown dog.