This is a very interesting painting. You've used the expressions of the two characters in the piece to tell a story. Quite hard to do in this realistic lighting style. Nice job.
There's a couple of stylistic issues, but nothing major. I would expect to see the sword handle to the left of the dark wolf's elbow, at this angle. That's a long sword, so it would need a sturdy handle to be realistically usable. Also, have a look at reference of wild arctic wolves eating. Blood on white fur stains VERY liberally.
I can see what you had in mind as far a setting and subject but I fear your execution was a bit stagnant. The background is by far more interesting than the two subjects. Their poses are very static there is no energy or emotion between the two making it unclear to the viewer about what is going on. I shouldn't have to read an artist comment or title to know whats happening. Are they fighting? Why are there only cuts on his arm? Is this a bad result of playing catch with a sword? The fact that the black wolf isn't even looking at or acknowledging the white wolf makes me feel as interested as he seems to be in the situation. Which would be not at all. So along with bland poses your sense of basic anatomy needs work. There are a lot of lopsided limbs and contorted proportions. This cannot be excused just because the subject are not human. There's also a lot of inconsistency with the fur texture making the entire work look unfinished.
So overall there's a good idea here, but it wasn't well done. There are a lot of inconsistent textures, values, and hues happening here. I feel like you only focused on your favorite parts and then brushed over everything else making the entire work look sloppy and unrefined.
Unless of course this is an incomplete painting to which I would suggest you mention that.
Great scene and poses. Just a couple things - the angle of the blade doesn't line up with the hilt, and there's not enough room for the dark wolf's forearm to be holding it. But that's really nit-picky of me.