A horse is a symbol of Life and Death. It also represents intellect, wisdom, mind, reason, nobility, light; dynamic power and swiftness. A horse can be a symbol for the instinctual animal nature, for magic powers.
A white horse is a symbol of pure intellect, innocence, life and light, courage, generosity. It can also be a symbol of lust (cf. Stallion).
In shamanic Tradition, a horse represents power. Horse is both physical power and unearthly power. "In understanding the power of horse, you may see how to strive for a balanced medicine shield. True power is wisdom found in remembering your total journey. Wisdom comes from remembering pathways you have walked in another person's moccasins. Compassion, caring, teaching, loving and sharing your gifts, talents, and abilities are the gateways to power." (Jamie Sams and David Carson, The Medicine Cards.)