If anyone's worried or not sure go into any pet shop and ask for beaphar anti parasite spot on for ferrets , that's right for ferrets , I use frontline spray during the season or when needed , the vet that sold it to me does voluntary work and says it's been used on two day old puppy's and kittens , two pumps onto latex gloves massage the first pump into lower half of ferret, second pump into top half , avoiding face eyes mouth. this stuffs strong if used like this will kill the lot and transfer to the bedding , as long as your using the right one , then the beaphar magic stuff doesn't work a