Building a robot dog (quadruped) comes down to 6 core blocks: 1. Mechanical design: a strong lightweight body 4 legs, usually 3 joints per leg (hip side, hip forward/back, knee). 2. Actuators: smart servos or BLDC motors gearbox. Each joint must have encoder feedback for accurate movement. 3. Sensors: IMU (gyroscope/accelerometer) for balance joint sensors, and ideally foot contact sensing. 4. Control electronics: a real-time microcontroller for motor control a small computer (optional) for high