I'm more inclined to believe it has something to do with the fact our hearts are emitting an energy field (scientists are just tapping into this) which they think extends for at least 5-7 ft as far as they can measure but no one would be surprised that field extends much further out. Perhaps the animals are tuned in to that unique energy field/signature of their owners and family they love?
The heart is the most powerful source of electromagnetic energy in the human body, producing the largest rhythmic electromagnetic field of any of the body's organs. The heart's electrical field is about 60 times greater in amplitude than the electrical activity generated by the brain.
