Police are appealing for a dog owner to come forward after an incident in Groudle Glen on Monday.
They haven't said what happened but have asked the woman, who was walking a Beagle type dog, to get in touch.
The woman has shoulder length blonde straight hair and was wearing a yello puffa style jacket.
It's believed she was in the glen just before 5pm.
Anyone who can help is asked to contact Police Headquarters.