Around three in the morning, our Labrador, Semi, suddenly burst into the room. He had been with us for eight years—an affectionate, well-behaved dog, always a part of the family. He never caused trouble and always respected the rules. But that night, something was different.

Semi hurried over to my wife’s side of the bed, placed his paws gently on her chest, and began barking. His actions immediately set off alarm bells in my mind. We had always forbidden him from jumping on the bed, and he had always obeyed. But now, his behavior was strange and unsettling.