This version... 200lbs. +, 325lb load capacity... more liekly something around 250lbs and still able to negotiate terrain and conserve power.
Field version perhaps that same weight, but using stronger and lighter materials.
AI software in computer games such as Call of Duty and the latest Halo is getting pretty advanced. Military versions can justify greater R&D funding, and will be more advanced if future "missions" call for it.
Biometric systems are not aynwhere near as refined as agencies would like, but are improving. The methodology and technolgy are advancing quite nicely.
Sniping weapons platforms are not a weight issue. Other systems can be deployed at less than 200lbs easily.
Missions?
Para-dropped behind lines to search for specific terrorist targets for individual elimination. The Dog can remain in position for extended times without cramping, tiring or needed to relieve itself. It doesn't care much about heat or cold, and when setting sites on a target, it is an excellent bench rest. Infiltrate and wait. Terminator style.
24/7 sentry. Anywhere, anytime. Against anyone. If it can't defend, it can attack. With an appropriate payload, it can be "suicidal", and destroy a target with explosives.
Armed medivac. The Dog, with an appropriate appendage, could conceivably pull men from a conflict while laying down fire. 2 or more would be great.
At this time, it can be laughed at. But don't forget that technology improves at an incredible rate, especially when gooberment funded. Our ability to create custom payloads and weapons packages for modular installation on various vehicles and craft is conceptually portable to this little mutt. Artificial intelligence, modern mission planning, GPS, land-based terrain following and avoidance, remote comms and control, modular weapons packages, optics of all types and adaptable software can make these things right dangerous indeed.
Imagine a trio of them going after your retreat.......