This is all previously shared, but UAVs are far more capable than a robotic dog in both maneuverability and cost.
autonomous Drone swarm maneuvering through a dense bamboo forest:
FPV flying through a stairwell:
Those FPV UAVs come in at <$500. The cheapest somewhat capable robot dog (Unitree go) goes for something like $2K.
Both would probably take just a single bullet/shrapnel to disable, but a FPV is infinitely harder to hit.
It's not really a matter of tech maturing either, a lidar equipped robotic dog will NEVER be cheaper than a grenade strapped FPV guided by a radio controller.