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Sounds like a Twilight Zone episode:
Researchers think dogs may tell time for things like dinner and walks using their circadian rhythm as an internal body clock or by "smelling time" (the way each part of the day smells helps them identify what should be happening next).

Researchers think dogs may tell time for things like dinner and walks using their circadian rhythm as an internal body clock or by "smelling time" (the way each part of the day smells helps them identify what should be happening next).
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