It's not fail! D8
The only real problem you have with drawing is the hind legs, in my opinion. It looks disproportional to the front legs, like they were shorter. My suggestion would be to study references of canines both as a whole organism as well as their skeletons. It really helps if you know the bone structure of what you want to draw.

Also, looking at it one more time, I noticed that the front right leg looks elongated compared to the front left leg. You should try to make them look the same length. Remember that there's no shame in editing to make it look better (duh)!

Other than that, it's a very sexy picture. 8D

Sagome, this is a wonderful picture indeed, all you need is a little critique! You didn't fail sagome, it's just you need help with back leg anatomy. Now sagome look at the back legs, do you see your problem? They're shorter then the front legs, usually legs need to be the same size for four legged animals. Now here's the main problem, the back leg that's on his side that you barely can see looks strange. To make it look better you need to add the knee on it like the other one. In fox anatomy you can still see the back legs evenly (it's hard to explain, so I hope you understand)

References you can use:
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All found on Google.com

I know you're a mouse user sis, but I think you can still manage to add some knee to the back legs. Just practice on paper and you'll be fine! Hope this helped a little.