Millions of people returning to the workplace means millions of dogs left home alone, some of them never having experienced their people being gone all day.

“This is something that’s a big deal for a dog, if you have been around home most of the time and now you’re going to go back and be gone 40-50 hours a week,” says Brian Hare, a professor of evolutionary anthropology and the co-director of the Duke University Canine Cognition Center.

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