Where they are (in the photo) is just below Haddock's, so I always give them the under-size or deformed carrots, windfall apples, and the occasional scything of lush grass. They also get given some bunches of grapes and handfuls of figs. Otherwise their lives are pretty boring.
In this heat (30ish C) the horses seem to suffer more than most of us. Their faces are COVERED with flies, what grass there is is dried up and scarce, and it's even too hot to be taken out for a ride.
I'm not sure which season they must hate most; the freezing cold of winter, or the fly-blown heat of summer.
No, I'm definitely happier being human. An horse's life is not for me!