My dog is smart.
My dog knows me well.
My dog likes to nap often.

My dog knows 99% of the time I have an even-keeled voice tone. My dog knows when my voice tone shifts to playful. She may return with a few playful barks to get the frisbee or tennis ball. She may even run in a circle in excitement. She knows the playful voice.
My dog also knows when a firm voice hits. Like the time I raised my voice to the teen to get a point across. She may shift her comfy spot by my foot to her lounge bed in a way saying I’m going to stand clear of that crazy lady. Dogs know people. They get a vibe whether it’s their owner or a stranger. Pay attention to the dog.
My dog can also recognize sadness, sickness or even a wiped out tired kind of weary. If I am lonely or need a snuggle for whatever reason she is there. Loyal to the core. This may have something to do with all the snacks I give her. She is there by my side. She knows it’s her time to comfort just like it was time to play. Dogs are intuitive. They know their owners and their environment.
Kids are similar when they are young. They cuddle when they are tired. They laugh when they play. They hide when they are in trouble. When the kids grow up, all that changes. Some lose their curiosity. Some lose their purpose. Hopefully they don’t lose their loyalty. This is where a dog differs. They want to grow old with you. They appreciate you no matter what your age or stature is in life. It’s unconditional love and companionship. Others may drift away in your life but the pet hovers.