Sentence:  The genuine "bloodhound" is not, naturally, the cruel, <WSD>bloodthirsty</WSD> animal he is generally supposed to be; nor is he the only dog that will hunt men. Like all pure hounds, he is mild, loving, and kind, and will hunt any game for which he is trained; ... 
Meaning of the word marked with <WSD> tags:  Thirsty for blood: inexorably violent or eager for bloodshed; murderous.