" Again and again he would lie down at her feet; only to waken presently with a thunderous growl and a snarl, and with a lunge of bared teeth at her caressing hand. The hand would continue to caress; and his show of fury was met with a laugh and with a comment:
"You've had a good sleep, and now you've waked up in a nice homicidal rage. "

― Albert Payson Terhune , The Heart of a Dog