I offered one of my pure JCP a rat pup instead of its normal F/T mouse that the original breeder kept it on, and the snake refused it pretty much immediately. I grabbed some of the Hog-nosed Snkaes mice and used them to rub all over the rat pup to transfer the scent. Reintroduced again to the snake, and she took it without a hitch. As others suggested, if this doesnt work, you may want to wash the rat off with ample water first then scent. Good luck!