Outside of a dog, a book is man's best friend

“Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read.”
― Groucho Marx, The Essential Groucho: Writings For By And About Groucho Marx

“Happiness is a warm puppy.”
― Charles M. Schulz

“Dogs never bite me. Just humans.”
― Marilyn Monroe

“If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man.”
― Mark Twain