Excellent one and all!
Yes - the "secret" here is that I shot the image at a Wolf Preserve with a 70-200 IS f/2.8L through a chain link fence. No flash - just ambient light. The sun was indeed behind the wolf, but the trees diffused it pretty well.
The key is in the out of focus (OOF) background. One of the biggest things people think about lenses is that they have to be perfectly clean. In fact, you can put a (small) finger in front of a lens, especially a telephoto and you won't see it (mostly). Remember there are lenses and especially telescopes with mirrors in the middle of the lenses, and you don't see those!
(Technically you can see them in the Out of Focus highlights, but that's another lesson).
I shot through the chain link fence, with the wolf far enough away from the fence that the fence would be blown completely OOF to the point that it dissapeared entirely.
The givaway is the background. Why? Because it's also OOF. The fence created an interference pattern which was different then then silky smooth interference pattern of the OOF background. It's almost like you splashed a fence into water and for a split second you could see the shape of the fence on the water's surface.
You don't see the effect on the wolf because he's in focus.
The lesson? Don't be afraid to take a picture through a chain link fence! If you can keep the subject far enough from it so that the depth of field (DOF) throughs the fence radically OOF, you'll get your shot!
Also if you didn't know, wolves don't bark - hence the title.
GAD