A 76-year-old woman was bitten by a dog, causing a cut and bruising.
The biting happened in Silchester Road, St Leonards, on Wednesday, July 30.
The victim was going to a newsagents at 10.30am when she was bitten on her leg by a brown or tan-coloured Staffie-type dog that tied up outside.
The owner came out the shop and left with the dog.
He is described as a white man, aged 20 to 25, and of slim build.
PC Antz Clarke said: "If you saw the victim get bitten by the dog or you know who the dog belongs to please get in touch."
Any witness or anyone with information about the incident is asked to email firstname.lastname@example.org or call 101 quoting serial 507 of 30/07. Alternatively, call the independent charity Crimestoppers anonymously on 0800 555 111.