A four-legged robot designed for stable locomotion over uneven terrain, capable of walking, trotting, and recovering from stumbles. Inspired by four-legged animals like dogs and horses.
A robot dog. Four legs give it stability and the ability to walk over rough ground, climb stairs, and recover if it trips. They're used for inspection, security, and as research platforms for legged locomotion.
Why It Matters
Quadruped robots bridge the gap between wheeled robots (limited to flat surfaces) and humanoids (still unstable). They're already commercially deployed for industrial inspection, security patrols, and hazardous environment exploration. China's Unitree has disrupted the market by making quadrupeds affordable.
Real-World Examples
- Unitree Go2 patrolling a solar farm for anomaly detection at $1,600
- Boston Dynamics Spot inspecting oil rigs and construction sites
- Xiaomi's CyberDog 2 as a consumer companion robot
Unitree Robotics (Hangzhou) revolutionized the quadruped market by offering the Go2 at $1,600, roughly 1/50th the price of Boston Dynamics' Spot ($74,500). This price disruption is a classic Chinese manufacturing strategy: achieve 80% of the capability at 2% of the cost, then iterate. Deep Robotics (Hangzhou) focuses on industrial-grade quadrupeds for power plant inspection.
