The world ‘wolf’ in English language stems from the aboriginal Old English wulf, which is thought to have been derived from the Proto-Germanic *wulfaz. The Latin lupus is a Sabine loanword. Both derive from the Proto-Indo-European root *wlqwos/*lukwos.
The following photos will give you a clear idea about the various wolves found in the world.
1 Eyes of the Dangerous Animal
2 A Beautiful Wolf Exhausted