Horses notice everything. Especially the little things that change in their environment. It’s part of their survival strategy, their lives as prey animals. Something out of the ordinary can be, well, life threatening.
Like the white lettering that appeared on the road at the bottom of the driveway overnight. The barking dogs can be ignored; the sound of blasting at the construction site down the street is fine; the letters on the pavement are not.
There was much snorting, some backing up and a lot of coaxing before we managed to tip toe along the side of the road around those horse-eating letters. Thank goodness by the time we returned they were old news and he walked right over them.