From Wikipedia (note words in bold):
Ferrari has used the cavallino rampante on official company stationery since 1929...A similar black horse on a yellow shield is the Coat of Arms of the German city of Stuttgart. This horse motif comes from the origins of the city's name: it comes from Stutengarten, an ancient form of the modern German word Gestüt, which translates into English as stud farm and into Italian as scuderia.