Hi Sue, Many times stress will cause digestive changes that can increase the odor in the feces... If the ferret has been with you for 10 days or more and this is an issue still - I strongly recommend that a vet run fecal testing to rule out parasitic, fungal and other infections. Coccidia will cause a nasty odor in the stools, helicobacter can as well, but usually the more intense the odor the more pronounced the intestinal bug. Stress, ulcers can cause this as well ,so a vet check up and perhaps anecdotal treatment should be considered. Best wishes, Alicia at www.ferretwise.org [Posted in FML 5936]