use to pull the string with the dog toy on it. so that pulls the string fast enough that the cat can chase it. >> good girl! >> the lure's movement has to be realistic enough to mimic actual prey on the run, or the cheetah will lose interest and its reward of meat. >> they must want that thing more than anything in the world. >> you have to make sure that that lure, that prey is just within reaching distance of that cat. so every stride they take when they're running, they think they're just about there, and just going to get it. >> sarah takes off. but is the temptation of the lure enough to break her own world record? ears tucked back. she races against the clock. >> she was at 62 miles an hour and still accelerating.