First off: many ferrets tolerate very low amounts of aspirin and some
actually have very low doses desired by vet for specific problems --
but this is RARE.
 
Secondly: THIS IS ESPECIALLY IMPORTANT: Tylenol and similar meds are
NOT aspirin and the Tylenol types of meds are extremely dangerous for
ferrets.  In even very low doses it will cause liver damage, and it can
be fatal even at low doses.  This med category is a terrible poison for
ferrets!
[Posted in FML issue 4478]