MUSCULAR DOG is a term used to describe three specific breeds of dogs: the Doberman (8 letters), the AKITA (5 letters), and the Bullterrier (11 letters). These breeds are known for their strength and agility, making them popular choices for guard and protection dogs. The Doberman is a medium-sized breed with a sleek coat and pointed ears, while the AKITA is a large breed with a thick double coat and a curled tail. The Bullterrier is a small breed with a short, dense coat and a muscular body. All three breeds are loyal and intelligent, making them excellent companions.