Sometimes we just get a sense about someone that they’re bad news. That doesn’t mean we’re right, of course — but oddly enough, the same isn’t true for dogs. When they sense that a person may be someone to avoid, science says that their instincts are spot on.

We all know that dogs have an incredible sense of smell. That’s why they’re sometimes used to sniff out drugs or bombs, or to protect our first responders.

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