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What Are Horse Blood Marks?

A blood mark is a type of marking found only on flea bitten gray horses.

The area on the horse that constitutes the blood mark is not gray like the rest of the horse: Instead, it is some other color. Commonly, the blood mark areas are red (chestnut) which gives the marking its name.

Below: A flea bitten gray horse with blood marks on the neck and shoulder.

Blood marks on a gray horse


While blood marks can appear anywhere on a horse's body they are perhaps best known for appearing on the shoulder area, and are therefore sometimes also called "bloody shoulder marks." They can be called a "blood mark" or a "bloody shoulder mark" no matter where they are located.

A blood mark on a horse is usually considered to be somewhere between unusual and rare.

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According to the book "Equine Color Genetics" by D. Phillip Sponenberg blood marks might increase in size as a horse ages:

"......An extremely rare occurrence is in Fig. 105, which shows patches of red color growing into the coat of a grey horse. These patches are called blood marks and can become progressively larger, resulting in a very aged grey horse that appears uniformly red."

Below: A blood mark on the side and belly of a gray horse.

Blood marks on the side and belly of a horse

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Horse Blood Marks and The Color Gray

Blood marks are unique to flea bitten gray horses. If you need a refresher on gray horse coloring here is a quick overview:

You can read more about gray horses here: How To... Recognize Horse Colors - Page 1.

The blood mark areas on a horse are not gray. As stated above they are some other color, most commonly red (chestnut).

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Blood Marks On Horses and "Somatic Mutations"

To better understand blood marks on horses it's handy to know they are a "somatic mutation." What is a somatic mutation?

Blood Marks and the Bedouin Mare

Blood marks, although an unusual marking on any horse, are traditionally associated with the Arabian breed. The breed originated in the great, inhospitable deserts of the Middle East and have long been prized by many different people, including the Bedouins who have made their lives in these deserts for centuries.

There is a legend about an Arabian mare owned by a Bedouin chieftain that describes how the very first blood mark came about. The following version is from Arabian Horse World magazine.

The Legend of the Bloody Shouldered Mare
As seen in the September, 1982 edition of Arabian Horse World magazine.

Long ago on the sands of a great desert lived a Bedouin chieftain by the name of Ahmed and his tribe. In the tents of Ahmed was his most prized possession, a beautiful grey mare who was renowned throughout the desert as the fleetest and most beautiful horse in the world. Many people coveted the mare, and kings and chieftains had tried to acquire her, but Ahmed could not be persuaded to part with his beloved mare.

Ahmed decided to breed his mare, and searched the desert for a suitable mate for her. After a time, the mare was bred to the premier stallion in the Sultan's stable. Months went by and the time for the mare to foal grew near.

Riding across the desert one day, several miles from his tents, Ahmed was seen by a group of robber Bedouins. Fearing that he would lose his beloved mare as well as his life, Ahmed turned and raced toward his tents, knowing in his heart that the mare, heavy in foal, could never out-distance the bandits. The mare seemed to realize that she was running for her master's life, and slowly, very slowly, she began to gain ground on her pursuers. Shots rang out and bullets peppered the sand around them as the distance gradually widened.

They were almost out of rifle range when at last a shot rang out. A bullet pierced Ahmed's heart, and he fell forward over the neck of his beloved mare. The mare never slackened her stride, and carried her master back to his tents on their final ride together.

Ahmed's people gathered around the mare and removed his lifeless body from her back. Down one of her shoulders, his blood had dried a nasty brown in the desert heat. There the mark remained, for no one could remove it.

That night in the tent of her dead master, the mare foaled. The foal was acclaimed by all as a perfect specimen of the Arabian breed, and on his shoulder was the same rusty red mark that his dam bore.

And so it came to pass that every great horse descended from that mare carried the mark of the bloody shoulder, and it was a thing greatly prized in the desert.

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