Try and put a man through a dense forest before you try your fancy robot dogs. You may not have been into a wild, unmanaged forest but there is no pleasant path to take, only large bushes and fallen trees everywhere. A man can barely walk through such areas, let alone a little robot dog. Forests with no growth on the ground are generally not found in the areas that China will most likely be using artillery.
And besides, we're illuminating targets for artillery. A small quadcopter will illuminate the foliage above the target just fine, no need for a robot to go illuminate the ground near the target, only for the shell to not be able to see the laser illumination. Because the laser is obscured by the dense forest's foliage.