Horse Shoe is fixed on the outer door of the house to keep evil sprits and evil eyes out of the house. It is considered as most auspicious item to remove bad luck and disease from the house. Horse Shoe work as a protective layer of the house , which protect the house from evil eye , negativity , tantra attacks and bad luck. Horse shoe also saves from bad effects of shani dev (Saturn).
It is recommended in our Vedas too that those who stick Horse Shoe on there outer wall or Door remains away from bad luck and diseases. The horseshoe is considered a lucky charm in the West as well as in India .The shape of the horseshoe decribes the ideal land configuration of Feng Shui, hence it is considered a favourable shape as per Feng Shui too. In India people have traditionally considered the horseshoe a a lucky charm and used it by affixing it above their main door on the outer side, for protection and good luck.