The photo stops fast motion during the night, so enough lighting was used to get a shutter speed of at least 1/100th.  From the lighting/shadowing, we can see that at least a couple of artificial light sources are present.  What is the likelihood that a wildlife photographer would set up for such a shot in anticipation of any animal, much less a wild wolf, jumping over the gate.  Given that the exposure seems just about perfect, we have to assume that lighting levels were set for about three feet above the gate -- this rules out animals not able/likely to jump it.  How likely is a wild animal to venture near such a set-up (with its associated human smells) when it could just as easily have jumped the stone wall?  So, without identifying the wolf in the photo, we can determine that the shot is almost certainly staged with a compliant animal.<p>Edit: It's a really, really good shot though.