Dear Stephanie: >My question is for Dr. Williams, or for another vet or medically inclined >person. Is pennyroyal safe to use on a ferret as a flea and mite avoidance >measure? A friend of mine uses it on her cats and dogs, but I wanted to >check before I decided to use on the fuzzbutt. Pennyroyal oil is pretty safe, although it's efficacy is questionable. Several years ago, there was a report on fatal intoxication in a dog, but I haven't seen anything since. Unfortunately, I can't give you a dose for it in a ferret. With kindest regards, Bruce Williams, dVM [Posted in FML issue 3260]