I wonder if the scientists (or you, for that matter) used squirrel scent to make it even more realistic. My dog has come to associate that smell with utter and abject failure (she once treed a squirrel in a hollow a foot off the ground, only to have her nose bit when she stuck it inside). Good thing my family doesn't hunt, as she'd be a poor hunting dog, despite being a Lab. Then again, we didn't train her to be one, either.