There is not always a specific meaning associated with a tattoo. In the case of the horse tattoo, for example, there is no specific meaning. It's a wonderful pet, always faithful helper of men in periods of expansion of ancient civilizations. It helped the man to get where he is now.
The first awards to the powerful animal were found in the third millennium BC in the area now known as Iran and Iraq, depicted on tablets of slate. The horse is a strong and intelligent animal, with strong wild instincts, which man has managed to tame.
As a Celtic symbol, the horse is associated with war, and it follows the attributes of victory, and the conquest of longevity.
Different meanings can also be found in the colors: a black horse can symbolize the mystery and can be the bearer of esoteric knowledge, while a white horse brings enlightenment, vitality and resurrection (the legend says that Buddha for example, has left the ground riding on a white horse).