Horse
A running horse stands for drive, advancement and movement. Riding one at a gallop is a good omen that work in hand moves quickly, and a white horse in particular was read as a benefactor's help or welcome news. A herd running together points to people gathering and the scale of things growing. But falling from a horse, or failing to control one that bolts, signals speed outrunning your grip — if you have many things open at once, close one before starting the next.
Horses carried news and carried people, so a horse in a dream was read as work beginning to move. The colour of the horse, and whether you are riding it or watching it, decide the reading.
Readings by Situation
Riding a horse at a gallop
A favourable dream of work advancing quickly. It suits matters where a position rises, such as a promotion or passing an examination, and if you have prepared something for a long time, this is the season it starts to move. Holding the reins firmly counts as better still.
Seeing or riding a white horse
The finest of the horse dreams. Help from an important person, or good news, was held to follow; dreamt as a conception dream it was read as a child who would come to something. White has long been regarded as a numinous colour.
A herd running together
People gathering and the work growing larger. It reads as others joining what you had been doing alone, or a group finding its energy. If the herd was in disarray, though, it means there are enough people that some ordering is needed.
Falling from a horse, or failing to hold a bolting one
A sign that speed has outrun control. If you have several things underway, it is better to tie one off before moving to the next. Tradition too read a fall as stepping down from a position, and so as a time for care.
Horse dreams speak mostly of movement and speed. A favourable one means this is the time to push, but speed without a settled direction ending in a fall is the other face of the same dream.