Curly horses are very interesting and diverse. Not all curly horses are completely covered in curly hair.
According to an unpublished research, curly horses lack a protein (which may be responsible for allergic reactions) in their coat.
They are hypoallergenic
During the heat of summer, most curly horses completely shed their curly hair so that they do not overheat.
They can completely shed their curly hair
All this means is that curly horses have a mane that falls towards both sides (i.e. left and right) of the neck.
Curly horses have a double mane
It is wrong to say that all curly horses are covered with curly hair. The best way to identify a curly horse is to check for curly hair inside its ears.