Do dogs have a sixth sense?

My dog barked and whined for about an hour around dinner time. He had gone outside, eaten, and wasn’t acting like anything hurt. For a while, he kept nosing around my grandmother’s door so I kept nervously checking on her. We’re also having a really bad snowstorm right now and are completely cut off, which makes me feel more jumpy. He does this almost every night at the same time. Part of me is really paranoid and I’m thinking that he knows something I don’t, but I’m also worried that something could be wrong with him. Why would he act this way?