This is a very common question that I receive.  I recently found a great article on the subject. The snippet below is just an intro, but you can click on the link at the bottom to see the full article.
 
Fighting for dominance is normal when introducing ferrets. The severity of which can range between almost no fighting to an all-out battle. It’s best to hope for the best, but “prepare” for the worst, which should make anything less than ferret to ferret warfare seem acceptable. It is imp...
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