What and how much do Belgian horses eat?

Their size matters. Horses are grazing animals so there stomachs are relatively small, designed to digest small amounts of food almost continuously. You have to be carefull on how much you feed them....

My Grandpa owns a horse farm and there's no specific amount. if they're adults they eat more then the kids. and some just regularly eat more! Horses require approximately 2% of their body weight in...

Yes. Horses generally don't know when to stop eating and can die from overeating.

you should feed them a healthy diet of nubs, fubs, and gubbers.

Horses eat a lot of food including wheat and grass.