Those get spooked by loud noises, and are subject to SPCA and other organization complaints.
bigdog does not spook, and can be abandoned in theatre if damaged.
My solutions have been used in battle for centuries. I'm pretty sure they can be trained to not spook. And I'm also pretty sure that they can be abandoned in theater if damaged.
They have many advantages, including that they are cheap, easy to replace, infrastructure and logistics for them were worked out long ago, and they can be powered anywhere there is something green growing, or even on the troops' own supplies.
Also I wait the landborne armed drone implementation, aka ED-209
They are already intelligent drones. DARPA is bragging that BigDog can avoid obstacles and follow someone. My solutions are better. Arming them is tricky, but I bet you could do remote control steering, aiming and firing.
I'm half-kidding, but I hope it has been considered.