Shawn, with older (and younger) ferrets getting aggressive, you need to
rule out medical problems such as adrenal.  Adrenal has many symptoms,
including hair loss, hair texture change, lethargy, weight loss,
hyperactivity, and aggression.  A ferret may only show one symptom, ort
may show more.  I would get full vet checks, including Tennessee Panels
on these guys if the vet cannot determine adrenal based on other
symptoms.  The earlier you catch it, the easier it is to deal with
 
Gail
Want to adopt an exotic?  Need help to place one?  Go here:
http://www.scalesandtails.org
[Posted in FML issue 4006]