Seeing a mare in your dream generally symbolizes a noble woman. If you dream of riding a horse, it suggests that you may be attracted to a virtuous and noble woman. Horses are commonly regarded as symbols of strength, courage, and respect for women. This dream may indicate the influence or presence of a noble personality in your life or hint at a significant relationship.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Mare" (page 266).
A mare in a dream represents a noble woman. If one sees himself riding a mare in a dream, it means that he may rape a chaste and a noble woman. In general, a mare in a dream represents people who are known for their honesty and good conduct. Buying a mare in a dream also means getting married. If one is already married, then it means that he will own a property or a farm. A mare in a dream also represents a rich person, a beautiful woman or a handsome looking man, a religious person, a comforting wife, a forbearing husband, or a sick person. If one loses his mare, or if it dies in the dream, it means that he will lose his source of income. Dismounting a mare in a dream may mean loss of one's business, a divorce, or loss of one's house. Hearing the squealing of a mare in a dream means increase in one's income, or it could mean one's promotion at work. Drinking the milk of a mare in a dream means developing a beneficial relationship with a politician. (Also see Donkey; Horse)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.