The construction industry faces an enduring safety risks, with preventable incidents causing significant human and economic costs. Traditional monitoring systems, while valuable, often operate reactively and struggle with the dynamic, context-rich nature of construction sites. We present a groundbreaking solution: The Multimodal LLM-Powered Robotic Dog for Construction Safety. This innovation fundamentally shifts safety management from passive compliance to proactive, intelligent prevention by merging cutting-edge artificial intelligence with agile physical deployment, creating an unprecedented closed-loop safety ecosystem when integrated with existing 4S Smart Safety Systems.