One more vote for a bear cub in mid stride. It looks like his rear leg to me.

I think it is a cub who may be running to keep up with mom who managed to avoid the camera.

I think its a bear cub but I dont think its a leg looks like a tail. 

The body doesn't look to be the right shape either. Looks too humped up, like a coon. The front leg also doesn't look quite right, and certainly doesn't match the thickness of the back leg if that is indeed a leg. That looks like a very awkward position for a leg to be in.

Bear kicking dirt over his scat with his hind leg?

I think a  raccoon when I blow up the photo looks like leg is a tail and it face looks different too just my two cents.

Tracey and I say Bear cub shaking its back leg

I'm goin with a black kangaroo

To be a bear cub, I think the back leg would have to abnormally long....even then the hip would have to be twisted and it doesn't look like it, and the other leg would be to short to match (got polio?).

If you blow the pic up...looks like a faint banding pattern on tail (leg?)

Its a coonbear hybrid.They interbreed a lot at night by mistake.

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That's one of those white muzzled, white pointy eared, masked bears!