Very nice! Your artwork is brilliant, and I admire the level of detail you take the time to put in. The colors are gorgeous as well, and I love the natural posing.
I have a few nitpicky things that you may want to keep in mind for the future, though:
First, the eyes seem like they're at an odd angle?
Second, the top part of the head/ears don't seem to line up with the snout. It looks like the ears are looking further up and to the right, while the snout is looking down and more toward the viewer, if that makes any sense.
Lastly, while I very much like how you didn't just draw stubs, put little lines in them, and call it a day for the paws, they do need some work. They are already very nice, but I think you would benefit from doing some studies on paws - they should taper more elegantly toward the end, instead of ending in abrupt blockiness. Also, the nails look like they've been clipped too short, so it would help to lengthen them.
Overall, this is a great piece of art. Other than my little nitpicky problems, it's absolutely lovely and breath taking! Please continue drawing and keep up the great work; you're a great artist and it would be a favor to all who view your art. c:

Drag to address bar and ignore the stuff below. c:
A briefcase sits on its side in the middle of the sidewalk.
Who could have left it there?
It's slightly open. You can just barely make out some words on the files inside.
TOP SECRET
Why is it there, if it's top secret?
...
You should know better than to investigate.
You should really stay out of trouble.
Look inside anyway. or
Leave it.