Question: Which type of horse has been used by both the British Household Cavalry and Anheuser-Busch Brewing Company for commercials?

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Clydesdale horse: The Clydesdale is a breed of draught horse named for and derived from the farm horses of Clydesdale, a county in Scotland.  Although originally one of the smaller breeds of draught horses, it is now a tall breed.  Often bay in color, they show significant white markings due to the presence of sabino genetics.  The breed was originally used for agriculture and haulage, and is still used for draught purposes today.  The Budweiser Clydesdales are some of the most famous Clydesdales, and other members of the breed are used as drum horses by the British Household Cavalry.  They have also been used to create and improve other breeds.

Horse Grenadier Guards: The Horse Grenadier Guards, usually referred to "Horse Grenadiers" were a series of cavalry troops in the British Household Cavalry between 1687 and 1788, who used grenades and other explosives in battle.  Originally attached to the Horse Guards, they became independent for a century before being disbanded.  However, the men of the troops formed the basis of the new troops of Life Guards.

Household Cavalry Mounted Regiment: The Household Cavalry Mounted Regiment (HCMR) is a cavalry regiment of the British Army tasked primarily with ceremonial duties.  Part of the Household Division, it is classed as a regiment of guards, and carries out mounted (and some dismounted) ceremonial duties on State and Royal occasions.  The HCMR is one of two operational units that form the Household Cavalry, the other being the Household Cavalry Regiment.  That unit is a formation reconnaissance regiment, with front-line combat duties.

Household Battalion: The Household Battalion was an infantry battalion of the British army during the Great War.  It was formed in September 1916 from the reserves of the Household Cavalry regiments (the 1st Life Guards, 2nd Life Guards and the Royal Horse Guards) to help fill the every-increasing demands for infantry on the Western Front.  Considerable effort was expended in the conversion of cavalrymen into footsoldiers trained and equipped for trench warfare.  The battalion spent its entire existence on the Western Front as part of the 4th Infantry Division, arriving as the Battle of the Somme was ending in early December 1916.  It fought in the Battle of Arras and later at Third Ypres, suffering severely in the assault on Poelcappelle.  Its last major engagement was the defence of Bourlon Ridge during the Battle of Cambrai in late 1917.  By this time, it had become apparent that there were insufficient reserves to support all the Household Cavalry regiments that had been converted to infantry (in particular, the Guards Machine Gun Regiments) and it was disbanded as part of a general reorganization in February 1918.

Pabst Brewing Company: The Pabst Brewing Company ( ) is an American company that dates its origins to a brewing company founded in 1844 by Jacob Best and was, by 1889, named after Frederick Pabst.  It is currently the holding company contracting for the brewing of over two dozen brands of beer and malt liquor from now defunct companies including Pabst Blue Ribbon, P. Ballantine and Sons Brewing Company, G. Heileman Brewing Company, Lone Star Brewing Company, Pearl Brewing Company, Piels Bros., Valentin Blatz Brewing Company, National Brewing Company, Olympia Brewing Company, Falstaff Brewing Corporation, Primo Brewing & Malting Company, Rainier Brewing Company, F & M Schaefer Brewing Company, Joseph Schlitz Brewing Company, Jacob Schmidt Brewing Company and Stroh Brewery Company.

Presidential Life Guard Dragoons Regiment: For more than a century (with a long break from 1987 to 2012) the Presidential Escort Life Guard Dragoons Regiment "Field Marshal Domingo Nieto" ("Regimiento de Caballeria "Mariscal Domingo Nieto" Escolta de la Presidente de la Republica") has been the official Household Cavalry and Dragoon Guards regiment of the Peruvian Army, with its primary responsibility to provide the ceremonial protection to the President of Peru and as well as public duties on the Government Palace in Lima.  It is one of Latin America's foremost guard regiments, and one of 2 active Household Cavalry regiments of the Peruvian Armed Forces, the other being the 1st Light Cavalry Regiment "Junin Hussars".

Household Cavalry: The Household Cavalry (HCav) is made up of the two most senior regiments of the British Army, the Life Guards and the Blues and Royals (Royal Horse Guards and 1st Dragoons).  These regiments are divided between the Armoured Regiment stationed at Combermere Barracks in Windsor and the ceremonial mounted unit, the Household Cavalry Mounted Regiment, garrisoned at Hyde Park Barracks (Knightsbridge Barracks) in London.  The Household Cavalry is part of the Household Division and is the Queen's official bodyguard.

Budweiser Clydesdales: The Budweiser Clydesdales are a group of Clydesdale horses used for promotions and commercials by the Anheuser-Busch Brewing Company.  There are several "hitches" or teams of horses, that travel around the United States and others that remain in their official homes at the company headquarters at the Anheuser-Busch brewery complex in St. Louis, Missouri, or at Merrimack, New Hampshire.  At St. Louis, they are housed in a historic brick and stained-glass stable built in 1885.  There are eight horses driven at any one time, but ten horses are on each team to provide alternates for the hitch when needed.  Assorted Clydesdales are also used as animal actors in television commercials for Budweiser beer, particularly in Super Bowl ads.

Household Cavalry Regiment: The Household Cavalry Regiment (HCR) is an Armoured Cavalry regiment of the British Army based at Combermere Barracks in Windsor.  It is the brother regiment of the Household Cavalry Mounted Regiment (HCMR) based at Hyde Park Barracks in London - both regiments together form the Household Cavalry.  The Household Cavalry was formed in 1992, under the Options for Change reforms, by the union of The Life Guards and the Blues and Royals in order to preserve the distinct identities of the regiments.  A precedent for the Household Cavalry Regiment has previously been set by the Household Cavalry Composite Regiment - active during the Anglo-Egyptian War, the Second Boer War and latterly during both the First and Second World Wars.

Corporal of horse: Corporal of horse (CoH) is a rank in the British Army's Household Cavalry corresponding to sergeant in other regiments.  Formerly, no cavalry regiments had sergeants, but the Household Cavalry are the only ones to keep this tradition alive.  It is said to stem from the origin of the word "sergeant", which comes from the same root as "servant".  Since even the lowliest trooper in the Household Cavalry was once a gentleman, it was considered that such a rank was inappropriate.  The rank of corporal of horse has existed since at least the 1660s.  The rank below is Lance-corporal of horse and that above is staff corporal.

Supporting paragraphs: Clydesdale horse Budweiser Clydesdales
Answer: Clydesdales