But Donut, she says, likely has another trick up her furry leg that we humans don't use to tell time (or at least we don't realize we use): "That's olfaction," [Alexandra] Horowitz says. "Dogs are living in basically an olfactory world, and I think they are able to track time with smells."

—  Read more in Can dogs smell time? Just ask Donut the dog at NPR.