I had rather be a dog, and bay the moon, Than such a Roman

The cat will mew, and dog will have his day.

Hold-fast is the only dog, my duck.

Do not swear by the moon, for she changes constantly. then your love would also change.

Thou call'st me dog before thou hadst a cause, But since I am a dog, beware my fangs

A good heart is the sun and the moon; or, rather, the sun and not the moon, for it shines bright and never changes.