My old, totally blind, and almost deaf dog, insists on being in the room where I’m working and promptly falls asleep. If I leave quietly for a few moments, he will awaken and then come looking for me. How is he sensing my absence?

This, as you have seen intuitively, is an intuitive capability. His antenna is always out and always receiving. This is true of everyone, that the intuitive apparatus never sleeps. This is part of the deep subconscious and its role in being part of the gateway to the external realms intuitively. So information is always flowing in and being picked up. He has simply determined that he needs to know your whereabouts and this is of the highest priority, so the part of his mind processing intuitive communication flow will be on the alert for a change in your proximity and will signal him and this will cause within a kind of alarm going off and he will awaken and then set about finding you. This is no different than people waking up on the dot at the same time every morning because they had set this intention, and then their intuitive apparatus will communicate with their guidance and they will be informed through the intuitive gateway that the wake-up hour is at hand, and this will come into their higher awareness as arousal and they will open their eyes and look at the clock and indeed it is the appointed time, to the moment. This is not skill at honing one’s inner alarm clock or inner timekeeper, this is an intuitive sensing and response when it is that precise. This, as you have deduced, is an important attribute with survival value for this pack animal so that it can stay with the pack, and especially, be in tune with the pack leader and its whereabouts, because part of its responsibility and duty in the pack is to do what the pack leader wants and that is first and foremost, to follow instructions, or to at least stay with the pack leader and be available to follow instructions if there is a need to change locations or a need to start a hunt requiring team effort, and so on.