Conversation

Leaving aside my own experiences here, I notice that my dog has this! If she sees me in person, even from very far away, she gets super pumped. If she sees me in video chat, even if I'm calling her name and right in front of her—nothing.
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Other dog owners tell me theirs behave the same way! Seems pretty consistent. At first I thought it might be about smell, but she'll react even if I'm quite far away, so I'm skeptical that's it. And she'll react without sound, so it's not hearing… gotta be visual, right?
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(I’ve never had a pet) Do dogs read emotion in face without body language or sound? Or they have to be specially trained? Maybe test with emotional assistant dogs to see if they recognize faces over video.
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