Grapes and raisins have caused acute kidney failure in ferrets, dogs, and cats and should not be given to any of those. Yes, it appears to be a volume dependent effect but ferrets stash raisins and then at times eat a number at once, and how much is too much may vary among individuals so they are better just totally avoided. This is an easy topic to look up and i am lacking time so will trust those with questions to go to places like the FML Archives (using the address in the FML header), ASPCA APCC, etc. and look up details. Sukie (not a vet) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html [Posted in FML 6291]