Do horses burp

Answer 1

Yes, just like us, horses burp to, I know because a horse burped at me once.

Answer2:

No, the vast majority of horses cannot burp. This is due to the same reason they cannot throw up. The shape of the esophagus and the strength of the sphincter muscle at the opening to the stomach typically prevent burping and throwing up. However some horse may have a weak sphincter muscle or an overly straight esophagus and can burp/throw up, but this is extremely rare.