HFH (known as Hydrocephalus, it is shortened to HFH for our purposes on this site)
HFH stands for Hydrocephalus in Friesian Horses - it s a recessive trait
HFH often results in stillbirths of affected foals and obstructed labor (dystocia) in dams, which can be fatal to the dam during birth. The condition is usually fatal and there is no effective treatment.
HFH is found in Friesian horses with as many as 15% of Friesian being carriers. It has been seen rarely in other breeds but it is not known at this time if it is caused by the same genetics.