3. Cyberdyne Guardian Series ($495,000)

The best security-oriented robot canines are represented by The Guardian Series. Equipped with military-grade encryption technologies, face recognition technology able of recognising up to 10,000 people simultaneously, and a sophisticated danger detection system, this model serves private estates and high-security establishments. High-net-worth individuals and government agencies choose it because of its carbon fibre build and unique servo motors, which provide silence operating and great agility.