Ookami or Okami?

[Tam_Hawkins]

http://www.wadoku.de/entry/view/1573766

Wadoku says Okami but for some reason the Hiragana writes oogami... i asume both works.

Edit: one think maybe: the japanese language sometimes puts an additional O in front of a word with the intend to be more polite, but i'm not sure i that works with something like wolf (i've only started to learn the language so my knowledge is very limited)

Edit 2:
Maybe i add the writting for it:
おおかみ
お = O
か = Ka
み = Mi

as you see 2 Os but the word in Arabic letters has an ō instead of OO.