Analysis of dreams
Horses are symbols of strength and opportunity.
There are two horses in your family, which means you may have new opportunities to choose from in your life.
Black stands for plain or low-key, and white stands for purity and beauty. You choose a white horse.
Riding on it shows that you are in control of your state (horses usually represent work, or lovers)
Touch it, and it will obey, indicating that you should put your feelings into it and care for it.
Showing off to others also shows that you are eager to be a person worthy of attention in reality.
People and horses suddenly fell under the bridge. This bridge represents the transitional period of life. Falling down at this time shows that you have a problem with your sense of superiority when your life changes and adjusts.
Water, meaning thoughts and feelings, is not deep, indicating that it is not too complicated. Sand and mud represent some blows and troubles.
Women give you toilet paper. They all represent traditional vision and experience and can help you.
You go after the horse to show that you want to save your former good feelings.
A sluice-like place, I think, represents the test of life and a particularly fierce environment.
When a girlfriend says she found it, she actually means that you can find your original good feelings.
Because you have worked hard and experienced exploration and test, you can get the affirmation of life.
Naturally, there will be a "horse", that is, finding a capable self.
Your girlfriend said it, because she is the one who agrees with you, appreciates you and helps you.