Back in 1966 Mister Ed went to college to become a veterinarian so he could help his friends beat the high cost of medical care. 50 years later here in Lancaster, Pennsylvania most horses are home schooled, which is more convenient and much less expensive.
Although not all horses are taught to read at a college level, the ones that pull the buggies are encouraged to develop basic skills including the ability to read signs. This is almost a necessity these days with all the confusing traffic rules like turning right on red.
You can lead a horse to water but if he finds it himself he has a sense of accomplishment and self-reliance. Note: we don’t know if horses are color blind but for the ones reading this I felt it was better in black and white.