• Dogs can recognize themselves in video reflections, but only by sound – They respond more to hearing their own barks.

• Dogs can tell time using their sense of smell – Scents fade over time, giving them clues.

• Dogs can hold grudges against other dogs – If another dog takes their toy, they might remember!

• Dogs can "laugh" when playing – It sounds like a breathy pant.

• Dogs can recognize fake barks – They know when another dog is just playing.