Some quotes:
""Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are God. Whereas owners of cats are compelled to realise that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
- Christopher Hitchens
"When dogs leap on to your bed, it's because they adore being with you. When cats leap onto your bed, it's because they adore your bed."
- Alisha Everett
"You can keep a dog; but it is the cat who keeps people because cats find humans useful domestic pets."
- George Mikes