Air conditioner filters changed? Warmer house temperature? Have you switch from A/C to heat? Cooler temps make odor less noticeable & fuzzies don't mind (my thermostat stays on 65. I wear long sleeves year round, lol) Ferrets altering sleeping arrangements and sleeping in a larger 'pile' rather than 1 or 2 to a sleep spot? A new arrival changes the 'pecking order' so males have a tendency to do a "long rub" across litter box edges to make sure the newbie knows he's around. A ferret that's sleeping longer than previously and emitting more than the usual 'sleepy ferret' smell? (Often an early insulinoma symptom) Descenting usually isn't a factor, unless the ferrets poofs frequently. Honestly, I'm not a dog person. but "several" indoor dogs (any breed) to me are more odiferous than 7 ferrets, unless they are those pampered pups that have bi-monthly professional groomer appointments. So I'd think something in the environment has changed. Food is a possibility. I've never fed Zupreem or 8in1 so I can't make any kind of judgment call on that. Washing bedding once a week should be ample for 7 ferrets, and baths are virtually unnecessary. Debi Christy <http://www.ferrets1st.com/> [Posted in FML issue 5063]