Biospot is definitely a danger for ferrets. I asked my vet about it and her
direct quote was:
 
"DO NOT USE Biospot on your ferrets!!!  Unlike Frontline and Advantage
Biospot is metabolized through the liver and kidneys and can cause damage
over time in dogs and cats---think what could happen to a ferret.  Advantage
and Frontline are truly topicals and not metabolized by organs other than
the hair follicles and sebaceous glands of the skin.  Much, much safer."
 
Mary and the gang of 15....
 
Mary McCarty-Houser
Pennsylvania Ferret Rescue Association
Director, Centre County Branch
http://home.sprynet.com/sprynet/ferretlady
[Posted in FML issue 2378]