This was something to learn on using Vitamin A, I've used Vitamin D for liver problems but not the A for anything. I am sending this article to our vet. The lady who has the pup and the ferrets will be going to her tomorrow. I am suggesting even without any symptoms to start all 4 on the A. And to add to this, having used the Neobicav for a long time now, I have never had a reaction. I keep the meds on hand in case and, of course, the vet does the rabies but so far not one reaction. Thank you Sukie. Millie Sanders at Txferretrescue.org with Texas Ferret Lovers Rescue and connecting Foster homes and sanctuaries [Posted in FML 8032]