At the Symposium it was stated that a fret's gut would be empty in just 6 hours. No ferret should be without food and water for more than that time. Also I perosnally believe that 4 hours is usually long enough fopr routine testing. I personally do not keep any fret without water for longer than 4 hours. They can dehydrate very quickly due to their fast acting metabo. rate. Thats just me but 6 hours is tops for fasting. Thank You Fred Hurd Reno Ferret Rescue [Posted in FML 5652]