"To begin with," said the Cat, "a dog's not mad. You grant that?" "I suppose so," said Alice "Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad." "I call it purring, not growling," said Alice. "Call it what you like," said the Cat."