Dog shouldn't you be happy? He died because of you. Luckily he is a robot and he replaced his memory into another one, so why are you mad shouldn't you be happy ? After all you will die because you are not a robot, you will just remain as a memory.
That dog is a living so he knew who is the real one and another replacement,even tho they said they had transfer the past data to a new one but still theyre a different things.its so sad T^T