'Man is not the only animal subject to dreaming. "We have every reason to believe that many of the lower animals do the same. Horses neigh and rear in their sleep; and dogs bark and growl, and exhibit all their characteristic passions. Probably at such times the remembrance of the chase or the combat was passing through the minds of these creatures; and they often manifest signs of kindness, or playfulness, and of almost every other passion:-

"The stag-hounds, weary with the chase, Lay stretched upon the rushy floor, And urged in dreams the forest race From Teviot-stone to Eskdale Moor."

Lay of the Last Minstrel.

'Ruminant animals, such, as the sheep and cow, dream less; but even they are sometimes so affected, especially at the period of rearing their young. If we descend still lower in the scale of life, we shall probably find the same phenomena to prevail; and judging from analogy, we should suppose dreaming to be almost a universal law, nearly as universal as sleep itself.' - Philosophy of Sleep.