The Icelandic horse can live outside all year. The horses were brought from Scandinavia over 1000 years ago. The origins were most likely diverse at that stage, but since then it has developed into a unique animal. No horses have been brought to Iceland since the early settlement of Iceland & it has been illegal to do so since 982AD. Though the horse is very resilient to Icelandic weather & unstable food sources, the isolation makes its immune system weak towards foreign horse diseases.