Honestly. There’s no “dog” in technology. With their awesome hearing, can they hear the other person’s voice? Do they know that it is another human person? Can they tell the difference between listening to music and talking on the phone? Can they understand the concept of talking to another person who is off the premises? Do they wonder about it? Or do they just accept it, because they love us? Or do they think we’re nuts?
Perhaps they think we’re just talking to ourselves holding a piece of plastic to our heads. Or are they wondering when we’re going to feed them next? That’s probably it – that last thing.