Northumbria Police said the incident in Holeyn Hall Road, Wylam was reported at 6.36pm on September 1.
The offender is described as being in his early 40s, with shaved, short hair and a tanned, slim build.
He was wearing a beige T-shirt and khaki brown shorts and was with one black and one brown dog, both believed to be spaniels.
Anyone with information should call police on 101, quoting log number 975 1/9/18.
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