Voice of command

When Alex was very young, maybe eighteen months old, he was visiting Grammie for the day. We went out for a walk in the neighborhood. We met a neighbor outside in her yard and stopped to talk. The neighbor had a young labrador retriever who was still learning obedience commands and was very frisky. Alex was waiting patiently for us to finish our conversation, but the dog was jumping around a lot. The neighbor finally turned in exasperation and said to the dog with a loud voice "sit". We were both extremely amused to see two young butts hit the sidewalk simultaneously. Alex clearly knew the voice of command when he heard it, and was soon sitting on the sidewalk next to the dog, both of them looking a little worried.