First off, I'd like to apologize for the low ratings I gave you; I don't mean it as an insult. But rather, looking at this image as a finished drawing, it's definitely lacking a lot of the things I look for in a visual piece of art.

With that said, it's a good start and I see it as more of a sketch for a more developed drawing.

The number one thing this drawing is lacking is attention to anatomy. I'd definitely recommend using a lot of wolf/dog anatomy references in the future. When drawing animals, I think it's important to pay attention to bone and muscle structure. If you don't pay attention to what's going on below the fur, the proportions end up looking strange. In this case, his head is a lot larger than the rest of him, and his paws and hind legs are very small.

Here are a couple reference images to get you started:
[link]
[link]

The colouring looks like it was quickly done, and would benefit from more detail (look at references to see how fur moves!) and more varied colour.

It'd also be nice to see a background, even a simple one. As he is now, Brian seems to be leaping through a blank space. A background would add a lot more visual interest.

I hope that helps, good luck!!