Jim, There are almost no or no documented cases of vitamin A toxicity in ferrets; they appear to differ from humans in that regard. You can find more in the FHL Archives. The only cases that even approach documentation that I know of off-hand were with a British breeder who constantly fed game liver and there were no necropsies or testing done there if memory serves. A Pubmed search of "Vitamin A" toxicosis ferret mustela brings up no results, nor do several variations on that search theme. Alternative cases of ferrets not doing well with very high amounts of such oils have been proposed such as an imbalance of oil types, or a problem with too much of another nutrient that a ferret would not normally get in high amounts. You can also find those in the archives. Nancy, There is a LOT in the FML and FHL Archives on diet hazards to pass along. Also, show them issues of Ferrets magazine and the IFC CD transcription which mention the kidney risks of raisin or grape eating (the work of Dr. Tom Kawasaki) and the ASPCA poison control document on the kidney risks for dogs. If they talk with the manufacturers they will find that a number are modifying foods to reflect current knowledge. Send a letter to the Petco corporate head veterinarian telling what they are doing and which store it is. -- Sukie (not a vet) Ferret Health List co-moderator http://www.smartgroups.com/groups/ferrethealth FHL Archives fan http://ferrethealth.org/archive/ replacing http://fhl.sonic-weasel.org International Ferret Congress advisor http://www.ferretcongress.org [Posted in FML issue 5170]