She loves to play, and she's an absolute nut about her ball. I think she would chase it till she drops dead. So, once we trained her to recognize the odor of human bones, and taught her that she only gets her ball when she finds the target odor, she became obsessive with trying to find that odor. Now, I just have to bounce the ball a few times and say: "D'ya want this? Find." She'll go out and start sniffing like a hyperactive kid, and before long she lets me know: "I've got something!"