I tried to keep the proportions just about the same and work around that
I left out the eyes because from this I can see that they are more of a style, as well as the whole thing looked more to the cartoonish style so I kept it that way.
[Oh my gosh sorry for the messy lines sketchy lines are something I can't advoid.]
Okay but fur tends to normally go down, because gravity, so the fur tufts you add here and there should mostly always be going down and in the same direction unless there are certain situations like if this was in the wind the fur, of course, could be going everywhere.
The belly also tends to have some tufts of fur that can be seen.
Wolf/Dog muzzles are also much longer than you would think, from what I saw it was mostly the length of a cat's muzzle.
The chin should always be slightly behind the nose.
I bet you are asking, hey why are there two sets of ears?
That's mostly because it is rare to see a dog or a wolf with their ears that far back and if they where relaxed they would be in the position of the blue line. The ears also tend to be a bit shorter and rounder if you really look at them.
The back legs are always going to be slightly larger than the front, and the hock is a lot rounder than the front. The front also tend to have a more sharper hock and are slightly smaller.
I think that's it?
I think I covered everything.
Oh yeah I also defined the paws a bit more because instead of being in a line there will be some digits which I higher than others.
Hope this helped a bit! I just tried to keep to your style