Dreams are one of the few unexplained phenomena familiar to (almost) everyone from first-hand experience. Dreams certainly exist, but what about something which no human has experienced: animal dreams? For science, the question is not as clear-cut as you might first think.
“It would appear that not only do men dream, but horses also, and dogs, and oxen; aye, and sheep, and goats, and all viviparous quadrupeds; and dogs show their dreaming by barking in their sleep,” Aristotle wrote in his treatise The History of Animals in the fourth century BC.
Any cat or dog owner will tell you their companion
