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The recommended dose for ferrets with Revolution is the 5-15 pound cat
size (not the 0-5 pound kitten size).  Not sure what the kilogram sizes
are over there but the regular cat size is what we use over here.
 
One tube for every ferret, then repeat in 3 weeks!  Some will even
require a third dose, but 2 doses will usually do it.
 
If you also have cats, rabbits, or dogs then treat them also.  You have
to treat every pet to get rid of ear mites.  Wash all of the bedding,
towels, hammocks, etc in the hottest wash cycle.  Clean out their cage
and room and all of the litter boxs too.  And repeat the cleaning in 3
weeks.
 
Hope that helps,
Jerry Murray, DVM
[Posted in FML issue 4809]