Although you can keep things in theme and get rules benefits by simply using a robotic "dog" as a robotic runner. The runner is better in almost every way.
True that. Also a free include, rather than the (admittedly low) cost of the dog.
I rather like robotic medics in that "speedy, not so fighty" role but they do cost quite a lot so something of an extravagance, and the utility of medkits makes you think twice about using it as a loot hauler. They are noteworthy as (I think) the only soldier in the game that actually fights in melee worse than a dog, due to the unarmed penalty - apparently they don't want to get their scalpels dirty stabbing people.

Harder to hit with shooting though, since their actual base fight is higher.