Regarding fleas and flea products. I would never recommend over the counter flea products on ferrets let alone cats and dogs. Zodiac flea collars are carbaryl which is a pesticide. Your pet constantly absorbs this toxic drug when wearing these collars and YOU also absorb the compound when you handle your pets. These pesticides are toxic to mammals which is why so much research has been done to come up with safer treatments for our pets. The newer products such as Frontline, Advantage, and Revolution are specific for biochemical processes in the flea that mammels don't have which is why they are so safe to use. Any animal can react to any compund but these products have excellent safety. The old pesticides however are bad news. Personally I use Frontline but in the spray form. The spray is dosed by weight which I feel is safer. Not only that but if you read the box and insert carefully, it lasts up to 3 months for fleas. And is very resistant to repetitive bathing. One bottle of Frontline will do mucho treatments which is extremely economical. My ferrets stay at the clinic and have never had fleas using this treatment and applying every 2 to 2 and a half months. I have used Frontline extensively on cats, dogs, sick animals, young, ancient, ferrets, raccoons, squirrels, etc. and neither I nor any of my clients has ever had a problem with the product (and no I don't have stock in the company!). There is a question of it's use in rabbits but many practitioners do use it. For rabbits however consider Revolution. PLEASE stay away from the over the counter products with pesticides, especially with safer products available. If you want to know how these products actually work, which explains why they're so safe for mammals, either the companies or your vet can give you the info. I know everybody has their own recommendations and ideas but this is what I tell my clients and what I do with my own fuzzies. Good luck - fleas are a pain. [A later PS] Regarding my prior post. Before anybody jumps down my throat, yes, Frontline, Reolution and Advantage are considered "pesticides" also, the difference and thence their safety is in the way they work. Hopefully each person will find out this info so they can make their own decision. Also remember that these products have other chemicals in them, like alcohol, etc. that allow them to spread over the body. Definately these compounds could cause a localized skin reaction. That is why I prefer the Frontline SPRAY dosed by body weight. Ferrets rule!! [Posted in FML 5729]