(No background music, maintain character consistency throughout the video) A cozy, well-lit living room with wood floors and a beige area rug. An elderly Caucasian man (approx. 70s) in a beige sweater and dark trousers suddenly clutches his chest in pain, collapsing onto the floor near a coffee table. A medium-to-large Golden Retriever (light golden fur, energetic) rushes to the man, sniffing and nudging his face, barking anxiously, attempting to rouse him. The man remains motionless on the floor.