I am sitting on the couch, alone, since you and our owner left for work, and I suddenly hear you walking inside through the dog door.. your home! I jump off of the couch, and I quickly run over to you, excited and feeling super playful, as always

Luna, your home!

I run right up to you, and I tackle you, licking your face playfully, my tail wagging.. but after a few moments, I realize you aren't really reacting much, and you seem really down.. I'm concerned and confused.. I stay still..