A brain exists, like any thing, in the four dimensions of time and space. Mind is different. Perhaps part of what's different is that Mind is extradimensional, but conforms to a brain's limitations when it incarnates. This is so because Mind is not a thing, and a robot is always wholly a thing. Recent books on science and the mind suggest the difficulties in fully replicating organisms as robots.
Love occurs when two beings are in sync, their brainwaves resonating in a silent, unseen duet.
It would seem that their beingness and ours is very literally on the same wavelength. It would be impossible for a partnership of love of the magnitude that can exist between two beings to exist between a robot and a human. A robot cannot have a mind that will resonate with ours. But the robot dogs of the future will be marvels of science that we cherish and respect, that charm us and break our hearts, entertain us and beguile us. I think that we will forget that robot dogs aren't alive, even while we are fully aware that the unnameable spice of an organic dog is missing.