1. They sniff you
Canines explore and interpret their environments through scent (they greet each other by sniffing butts, after all). When your Dachshund sniffs you, it’s a strong indication they’re happy to see you. Since your smell is unique, not only does breathing in your essence ensure it’s really you, it triggers pleasure centers in your dog’s brain. Researchers from Emory University safely administered MRIs to dogs to determine what happens to their brains when presented with familiar scents. The result? Lots of activity in the caudate nucleus, the area of the brain linked to rewards and pleasure. In fact, nothing made the dog’s brain light up more than the smell of a human they knew well (that’s you!).