There are many things to consider with the biting ferret including previous possible medical causes for the aggression . Recently purchased or adopted ferrets may not have been handled or trained and may be a bit nippy. Gentle nips are natural and normal to the ferret that will often bite at other ferrets in the effort to play. Left unchecked, these playful nips can develop into painful bites. Frightened owners stop handling these biters or mistreat them and biting is exacerbated.
Ferrets can become aggressive from adrenal gland hormone overproduction.
Adrenal androgens can produce sexual behavior in neutered males that is usually directed at other household ferrets, but can occasionally be directed to humans. This type of behavior includes nipping, mounting, biting, and dragging other ferrets, particularly by the scruff. Violent shaking is too excessive and should be prevented. The final consideration for the biting ferret is plain. This is an important differential for the ferret that has always been gentle.