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

Animals are such agreeable friends—they ask no questions, they pass no criticisms.

Man, when perfected, is the best of animals, but when separated from law and justice, he is the worst of all. 

When the eagles are silent, the parrots begin to jabber.

Animals are good to think with.

Who sleepeth with dogs shall rise with fleas.

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. 

I hate the sight of monkeys; they remind me so of poor relations.

If you are a dog and your owner suggests that you wear a sweater, suggest that he wear a tail.

Alas! We are ridiculous animals.

How like to us is that filthy beast the ape.

In every man is a wild beast; most of them don’t know how to hold it back, and the majority give it full rein when they are not restrained by terror of law.

Every creature in the world is like a book and a picture, to us, and a mirror.