Beverley Burkitt, 45, who has dwarfism, became lost in forest while walking with her tiny dog Pebbles, reports the Daily Telegraph.
The alarm was raised but she had not been found when night fell, so she lay on the floor and cuddled the dog to keep warm.
A search party found her the next morning and rescuers said the dog had saved her from getting hypothermia.
Mum-of-one Beverley said: "Pebbles lay across my legs overnight and kept me warm. I wasn't too worried because I knew I would be found sooner or later."
Beverley and her daughter, 15, were staying at a pony trekking centre at Dolwyddelan, North Wales, when she went missing.
She told rescuers that she strayed into woodland and then dropped her mobile phone.
A helicopter with heat-seeking cameras was launched and search parties on the ground scoured the area but it was not until the next day that she was found after her mobile phone was discovered on a path.
Asthma sufferer Beverley, of Colwyn Bay, North Wales, was found still snuggling up to the long-haired black and white chihuahua.
Chris Lloyd, of the Ogwen Valley Mountain Rescue, said: "She realised she was lost and just waited. Luckily it was quite a mild night and she had her dog to keep her warm."
