The attack happened down a footpath off Springfield Avenue
A woman was raped after a man asked her to help him find his dog, police have said.
The attack happened off Springfield Avenue, Chesterfield, on 25 March between 22:05 and 22:25 GMT.
The victim was approached by a man who said he had lost his dog, but after walking down a footpath, was pushed to the ground and raped, officers said.
Detectives said they want to trace a man in his 20s with short black spiky hair, who spoke with a local accent.
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