Thanks for the feedback. The breeder was feeding him fuzzy mice (and therefor recommended I do the same). The pinky rat I fed him last week (because the pet store had no mice fuzzies at the time) was pretty much the same size as the fuzzy mouse I fed him this week, in which he did the same thing of eating it without killing it first. With the fuzzy mouse he did at least try to constrict first. The size of the rodents I've been feeding him are consistent with the size of his body.