Benjamin Franklin
There are three faithful friends, an old wife, an old dog, and ready money.

Euripides
I hate it in friends when they come too late to help.

Harry S. Truman
You want a friend in Washington? Get a dog.

Clifton Fadiman
One measure of friendship consists not in the number of things friends can discuss, but in the number of things they need no longer mention.

Alice Duer Miller
When a woman like that whom I’ve seen so much, All of a sudden drops out of touch; Is always busy and never can, Spare you a moment, it means a man.