Unknown Horse dream meaning is explained below using 1 different source. Each interpretation is shown with its source.
Interpretation 1 — Ibn Seerin
Seeing an unfamiliar horse which he does not own nor mounts means that he is a man of good repute and high honour.
If he sees such a horse entering his neighbourhood or house it means a powerful and honourable person will make his appearance in that neighbourhood or house.
If he sees such a horse leaving such a neghbourhood or house it means a man with same qualities mentioned above will leave the neighbourhood or house either by way of going away for good or death.
Source: Islamic Dream Interpretation • Author: Ibn Seerin