Man is a noble animal, splendid in ashes and pompous in the grave.

What delight can there be, and not rather displeasure, in hearing the barking and howling of dogs? Or what greater pleasure is there to be felt when a dog followeth a hare than when a dog followeth a dog?

Happiness is a warm puppy.

I do not mean to call an elephant a vulgar animal, but if you think about him carefully, you will find that his nonvulgarity consists in such gentleness as is possible to elephantine nature—not in his insensitive hide, nor in his clumsy foot, but in the way he will lift his foot if a child lies in his way; and in his sensitive trunk, and still more sensitive mind, and capability of pique on points of honor.

An ape will be an ape, though clad in purple.

Man is no man, but a wolf, to a stranger.

Animals are in possession of themselves; their soul is in possession of their body. But they have no right to their life, because they do not will it. 

A good dog, sir, deserves a good bone.

Man is the only animal that can remain on friendly terms with the victims he intends to eat until he eats them.

Be a good animal, true to your animal instincts.

How like to us is that filthy beast the ape.

Histories are more full of examples of the fidelity of dogs than of friends.

Who sleepeth with dogs shall rise with fleas.