It really depends on yourself.
However,we got two big catergory of view first:
1.Personality.That mean a shy and quiet person might be water,etc.......
If we assume furries are simliar to humans,they would have mixed elements like us:Let's say Wind represent Active and Water represent timid.It is not a rare sight to see people being shy and active.
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2.Body.A wolf with fire as its fur can be fire elemented.(duh)
: D Very basic,not much argument here....I am still a kid,not a sage.
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You can't really use a element to represent possibly 13278947192379 races(who know is there ailen furries?)......