YouTuber "Melanie M" filmed a family member telling their dog Charlie that he'd be getting a baby sister.

The baby was set to arrive tomorrow, so they gave Charlie a piece of clothing with the baby's scent on it. Dogs associate by smell, and this would prevent him from freaking out when she arrived. Charlie takes a whiff, pauses for a few moments, and, well, just watch the video. Is he disgusted? Nervous? Scared? Those are totally normal emotions for a dog going through your situation, Charlie. We're all here for you.

Sources: Melanie M/YouTube