Quadruped Robots
Quadruped robots are the proven workhorses of legged robotics, four legged machines spanning consumer and research platforms such as the Unitree Go2 and AlienGo, industrial tiers from the carryable AS2 through the hot swap A2 and waterproof B1 to the extreme environment B2, and AgiBot's Kutuo D1 and D2 Max, with wheel leg hybrids crossing mixed ground, from the manufacturers leading the global market.
Quadruped Robots
Before robots learnt to walk like people, they learnt to walk like dogs, and that head start still shows. Quadruped robots are legged robotics' proven division: four legged machines with a decade of real deployments behind them, stadium famous and substation tested, spanning every tier from the Unitree Go2 in living rooms and lecture theatres to the IP67 sealed B2 working sites that would drown, freeze or bake anything gentler, joined across the market by AgiBot's Kutuo D1 line and extended by wheel leg hybrids that roll the kilometres and step the rough ground.
Four legs earn their keep on physics: a quadruped is stable at rest where a biped balances, carries payload over terrain where wheels surrender, kerbs, stairs, rubble, mud, snow, and does it all with the maturity premium of the category robots industrialised first. The commercial record matches: Unitree, the global quadruped leader, still draws roughly 42 per cent of its revenue from the dog line per its IPO prospectus, the mature business whose volumes built the company, whilst the machines themselves compiled the deployment literature, inspection rounds, security circuits, research fleets, that every newer robot category now borrows credibility from.
For European buyers, whose utilities, plants and estates span some of the world's wettest, coldest and most stair rich infrastructure, the tier map below is the purchasing map, and the full range of quadruped robots for sale can be explored through this page.
Background
The category that proved legged robotics
Quadrupeds carried the burden of proof for every legged machine that followed: the AlienGo era's viral agility made the public believe, the Go generation's pricing made ownership ordinary, and the industrial B and A lines made facility managers sign, years of fielded rounds establishing that legs could hold duty cycles, survive weather and return investment. By the time humanoids arrived asking for trust, the dogs had already banked it.
A market sorted into tiers
Competition organised the category with unusual clarity: a consumer and research tier, a lightweight professional tier born in 2026 when the AS2 broke the assumption that industrial dogs start at 40 kilogrammes, a daily workhorse tier, a wet and value tier, an extreme environment summit and a laboratory classic, with wheel leg hybrids crossing between them, so that a European buyer's question is rarely whether a quadruped exists for the mission, only which tier the mission weighs.
The Quadruped Lineup by Tier
Consumer, Education and Research Entry: Unitree Go2
The Go2 is the world's robot dog: roughly 15 kilogrammes sensing through Unitree's self developed L2 4D LiDAR across a 360 by 96 degree hemispherical field, athletic through simulation trained gaits, conversational through large model voice, laddering from the Air and Pro trims to the Jetson Orin equipped EDU that anchors the largest community in legged robotics, with the Go2-W hybrid adding wheels and mission fit outs to searchlight and thermal builds.
Lightweight Industrial: Unitree AS2
The AS2 put professional credentials in a carry case: 18 kilogrammes delivering roughly double the Go2's dynamics on 90 newton metre joints, speeds past 5 metres per second, a 65 kilogramme standing load demonstrated beneath a 105 kilogramme adult, 15 kilogramme working payloads across more than 13 kilometres, and a minus 20 to 50 Celsius envelope, one person portable industry, with the AS2-W hybrid variant beside it.
The Daily Workhorse: Unitree A2
The A2 owns the routine round: 37 kilogrammes carrying 25 kilogrammes on the move and 100 standing, more than five hours and 20 kilometres per charge, and dual 9,000 milliamp hour parallel batteries that hot swap without stopping the mission, behind dual front and rear 3D LiDAR, an IP56 chassis with IP67 internals and a minus 20 to 55 Celsius rating, the specification of the shift that never pauses.
The Waterproof Value Tier: Unitree B1
The B1, the 2021 veteran still in the catalogue, holds the wet work: approximately 50 kilogrammes behind genuine IP68 immersion class sealing, the family's deepest formal waterproofing, with 20 kilogramme class working loads at veteran pricing and a mature parts base, the rational choice where the mission is flooded, rain soaked or washdown rated.
The Extreme Environment Summit: Unitree B2
The B2 is where the category meets its hardest sites: 60 kilogrammes, IP67 sealed, 360 newton metre joints, sprinting to 6 metres per second as the fastest industrial quadruped built, carrying to 40 kilogrammes with optional autonomous charging for unattended operation, thinking on 275 TOPS of Jetson AGX Orin, and switching between legs and wheels as the B2-W.
The Research Classic: Unitree AlienGo
The AlienGo remains the laboratory's mid size standard: the 2019 platform of a thousand citations, 10 to 13 kilogramme payloads, up to 4.6 hour swappable battery sessions, posture and face recognition with gesture locked following, and the classic Z1 robotic arm pairing that made it mobile manipulation's accessible bench.
The AgiBot Quadrupeds: Kutuo D1 and D2 Max
AgiBot's Kutuo D1 series brings the volume leading humanoid maker's intelligence stack to four legs, quadrupeds for patrol, inspection and load carrying extended by the all terrain D2 Max, and lets mixed sites source their legged and humanoid fleets, one AI platform across both, from a single vendor.
Tier Comparison
| Tier | Platform | Weight | Payload (walk / stand) | Envelope | Signature |
|---|---|---|---|---|---|
| Entry & research | Go2 | ~15 kg | ~8 kg / — | IP54 | 4D LiDAR, largest community |
| Lightweight industrial | AS2 | ~18 kg | ~15 kg / 65 kg | IP54, −20–50 °C | Carryable industry, >13 km |
| Daily workhorse | A2 | ~37 kg | 25 kg / 100 kg | IP56, −20–55 °C | Hot swap without stopping |
| Wet & value | B1 | ~50 kg | ~20 kg / ~80 kg | IP68 | Immersion class veteran |
| Extreme summit | B2 | ~60 kg | 40 kg / higher | IP67, −20–55 °C | 6 m/s, 275 TOPS, B2-W |
| Research classic | AlienGo | Mid size | 10–13 kg / — | Controlled sites | Citation hardware, Z1 host |
AgiBot's Kutuo D1 and D2 Max extend the market beside them; figures follow published specifications and configurations are confirmed at quotation.
Which quadruped robot suits which buyer?
Weigh the mission, then read the ladder. First robots, classrooms and research programmes take the Go2, EDU trim for laboratories. Professionals who carry their robot to the job, surveyors, responders, light inspection rounds, take the AS2. Facilities running daily circuits with real cargo take the A2's unbroken hot swap endurance. Wet infrastructure, water treatment, storm season perimeters, washdown environments, takes the B1's IP68 at veteran pricing. Sites that destroy equipment, energy, mining, heavy industry, take the B2. Laboratories wanting maturity and manipulation take the AlienGo, and unified humanoid plus quadruped fleets consider the Kutuo line. Mixed ground at any tier takes the hybrids, and every working deployment completes with mission software, RoboPatrol and RoboInspect class systems from the robot software catalogue.
Technology
Four legs, engineered in house
The category's leaders build their own joints, batteries and sensing, Unitree down to selling its Go-M8010-6 and IM6014 motors as spare parts and shipping its own 4D LiDAR line, vertical integration behind both the tier's pricing and an accessories catalogue with genuine component depth, batteries, chargers, controllers, motors, LiDAR modules and the Z1 arm.
Gaits from simulation, updated for life
Modern quadruped locomotion is trained at simulation scale and delivered to hardware, terrain climbing, self righting, disturbance recovery, then improved across the installed base by over the air update, the sim to real pipeline this category pioneered and the humanoid era inherited wholesale.
Autonomy sized to the site
The tier's sensing and computing scale with severity, from the Go2's app assigned point cloud routes through the A2's dual LiDAR SLAM in GPS denied plants to the B2's 275 TOPS and self charging unattended rounds, autonomy as a configuration ladder matching the deployment ladder beneath it.
What are quadruped robots used for?
- Industrial inspection: substation, plant and pipeline rounds across inspection robotics, the mission that industrialised the category.
- Security patrol: all weather perimeter circuits across security robotics at every tier from campus to critical site.
- Research and education: the default legged platforms of research and educational robotics worldwide.
- Consumer companionship: the Go2 as the first mass legged machine of consumer robotics.
- Logistics and site carry: 15 to 40 kilogramme transport across logistics and industrial ground.
- Emergency and hazardous response: thermal equipped and immersion sealed reconnaissance across emergency response robotics.
- Mobile manipulation: Z1 arm pairings putting hands on legs for research and light work.
- Events and entertainment: the synchronised crowd favourites of exhibition and entertainment bookings.
Pricing and Availability
Quadruped robots are available for purchase across Europe and worldwide at every tier, from single Go2 units to industrial fleets with charging infrastructure, spanning the Unitree line, AgiBot's Kutuo series and their hybrids alongside the wider catalogue on Robots Europa. Quadruped robot price and cost vary enormously by tier, model, trim and configuration, so buyers seeking quadruped robots for sale should request a current quotation for their requirements, with European delivery, customs clearance and support arranged through Robots Europa. Purchasing enquiries, specification sheets and availability details for those looking to buy quadruped robots can be found on this page.
Frequently Asked Questions
What are quadruped robots?
Quadruped robots are four legged machines spanning the consumer and research Go2, the lightweight industrial AS2, the workhorse A2, the waterproof B1, the extreme environment B2, the research classic AlienGo and AgiBot's Kutuo D1 line, plus wheel leg hybrids, legged robotics' proven working division.
How do quadruped robots work?
They move on self developed high torque joints under gaits trained at simulation scale, perceive through 4D and 3D LiDAR with camera fusion, navigate and map autonomously or follow operators, endure through swap and hot swap battery architectures up to autonomous self charging, and improve continuously by over the air update.
Why choose a quadruped over a wheeled or bipedal robot?
For terrain with payload: four legs cross the kerbs, stairs, rubble, mud and snow that stop wheels, whilst standing stable where bipeds spend energy balancing, at the maturity and pricing of robotics' most proven legged category, with hybrids adding wheels where ground allows.
What are the benefits of quadruped robots?
Key benefits include a complete tier ladder from 15 kilogramme companion to IP67 flagship, all terrain capability with genuine working payloads, weather envelopes to minus 20 Celsius and immersion class sealing, component level parts supply, the deepest deployment record in legged robotics and the largest developer community.
Which quadruped robot suits European industrial sites?
By severity: the AS2 for carryable professional rounds, the A2 for daily routes with hot swap continuity, the B1 for Europe's wet infrastructure at IP68, and the B2 for energy, mining and extreme sites, with autonomous charging configurations serving remote and unattended European facilities.
Can quadruped robots carry equipment or arms?
Yes, by design: working payloads run from the AS2's 15 kilogrammes to the B2's 40, powered payload interfaces carry sensors, thermal kits and communications, and the Z1 robotic arm converts platforms, classically the AlienGo, into mobile manipulators, all quoted as bundles.
Where can I buy quadruped robots and what do they cost?
Quadruped robots are for sale through Robots Europa, serving the United Kingdom, the European Union and markets worldwide with delivery, customs clearance and support. Because cost varies enormously by tier and configuration, buyers should request a tailored quotation. Full purchasing details are available on this page.
Summary
Quadruped robots are legged robotics with the receipts: the category that proved legs could work before the humanoid era asked anyone to believe it, now sorted into a ladder so clean it reads like a purchasing guide, Go2 to learn, AS2 to carry, A2 to run the route, B1 to work the water, B2 to survive the site, AlienGo to publish the paper, Kutuo to unify the fleet, with wheels available at three tiers and a parts catalogue reaching down to the motors. For Europe's wet, cold, storied infrastructure, four legs remain the most deployable answer in robotics. As the proven division of legged machines, quadruped robots stand as its definitive working category, and this page as the European starting point.
v3, August 9, 2026