seriously though he just comes in the doorway and just like looks at me for like even up to like a minute, and if I say anything at all, even trying to beckon him, he just immediately turns around and leaves. is this documented behavior or is this like a bug or something
what is he plotting?
Your dog is sending a keepalive packet with no data to maintain his TCP connection with you and returning to idle after receiving your ACK; this is well-defined behavior.