Gray (horse) in the context of "Equine coat color"

The Royal Scots Greys was a cavalry regiment of the Scots Army that became a regiment of the British Army in 1707 upon the union of Scotland and England, continuing until 1971 when they amalgamated with the 3rd Carabiniers (Prince of Wales's Dragoon Guards) to form the Royal Scots Dragoon Guards. The regiment's history began in 1678, when three independent troops of Scots Dragoons were raised. In 1681, these troops were regimented to form The Royal Regiment of Scots Dragoons, numbered the 4th Dragoons in 1694. They were already mounted on grey horses by this stage and were already being referred to as the Grey Dragoons.

Following the formation of the united Kingdom of Great Britain in 1707, they were renamed The Royal North British Dragoons (North Britain then being the envisaged common name for Scotland), but were already being referred to as the Scots Greys. In 1713, they were renumbered the 2nd Dragoons as part of a deal between the commands of the English Army and the Scottish Army when the two were in the process of being unified into the British Army. They were also sometimes referred to, during the first Jacobite uprising, as Portmore's Dragoons. In 1877, their nickname was finally made official when they became the 2nd Dragoons (Royal Scots Greys), which was inverted in 1921 to The Royal Scots Greys (2nd Dragoons). They kept this title until 2 July 1971, when they amalgamated with the 3rd Carabiniers, forming the Royal Scots Dragoon Guards.

Markings on horses are usually distinctive white areas on an otherwise dark base coat color. Most horses have some markings, and they help to identify the horse as a unique individual. Markings are present at birth and do not change over the course of the horse's life. Most markings have pink skin underneath most of the white hairs, though a few faint markings may occasionally have white hair with no underlying pink skin. Markings may appear to change slightly when a horse grows or sheds its winter coat, however this difference is simply a factor of hair coat length; the underlying pattern does not change.

On a gray horse, markings visible at birth may become hidden as the horse turns white with age, but markings can still be determined by trimming the horse's hair closely, then wetting down the coat to see where there is pink skin and black skin under the hair.

The Lusitano, also known as the Pure Blood Lusitano or PSL (Puro Sangue Lusitano), is a Portuguese horse breed. Horses were known to be present on the Iberian Peninsula as far back as 20,000 BC, and by 800 BC the region was renowned for its war horses. The fame of the horses from Lusitania goes back to the Roman Age, which attributed its speed to the influence of the West wind, who was considered capable of fertilizing the mares. When the Muslims invaded Iberia in 711 AD, they brought Arabian horses with them that were crossed with the native horses, developing a horse that became useful for war, dressage and bull fighting. The Portuguese horse was named the Lusitano, after the word Lusitania, the ancient Roman name for the region that modern Portugal occupies. There are four main breed lineages within the breed today, and characteristics differ slightly between each line.

Lusitanos can be any solid color, although they are generally gray, bay or chestnut. Horses of the Alter Real strain are always brown. Members of the breed are of Baroque type, with convex facial profiles, heavy muscling, intelligent and willing natures, with agile and elevated movement. Originally bred for war, dressage and bullfighting, Lusitanos are still used today in the latter two. They have competed in several Olympics and World Equestrian Games as part of the Portuguese and Spanish dressage teams. They have also made a showing in driving competitions, with a Belgian team of Lusitanos winning multiple international titles.