A woman was raped as she walked her dog in the early hours of Saturday morning.
The 28-year-old was attacked as she cut through an underpass in the Craigshill area of Livingston, West Lothian, between 3.20am and 3.45am.
She fell to the ground and was subjected to a horrific sexual assault, Lothian and Borders Police said.
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When the attacker made off, the woman made her way home and then went to St John's Hospital, where police were contacted.
The man is white, 25-40 years old and has a Scottish accent, with collar-length black or brown hair and is of a small build. He smelled strongly of body odour and alcohol and was wearing a dark-coloured fleece and dark-coloured beanie hat.
Police are appealing for a potential witness with two black Labrador-type dogs, who is thought to have been in the area at the time, to come forward.