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First of all, the word is 'hyaena' not 'hienna'.
Secondly, Isengard lay at the southern reaches of the Misty Mountains so I suppose Wargs could be there too. Gandalf (and if I'm not mistaken,Merry and Pippin') mention that there were wolves in Isengard's armies. It was thus perfectly possible for Saruman to send out Wargs (which we can assume those wolves were.)
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Nothing is evil in the beginning,even Sauron wasn't
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