Hayate Black, known as 'Black Hayate' in Fullmetal Alchemist (Hagane no Renkinjutsushi), is a black Shiba Inu dog adopted by Riza Hawkeye, a supporting character in the series. Black Hayate is known for his intelligence, loyalty, and disciplined behavior, often seen following military orders from Riza. Although not a central figure in the main plot, Black Hayate provides both comic relief and emotional warmth, symbolizing the close bond between Riza and her companions within the military.