I love this. I just do.
The colors, how it's drawn, everything.
Might seem a bit biased, but I love it. Its simple but original, it looks nice, and Its appealing to the eyes. It has a good contrast though you could do a bit better with the forepaws instead of making them completely black.
Anyways, You can work harder and make better things.
If it had a background, it'd look neater.
But, since it wasn't mean to originally have a background, its fine and looks okay all together.
Keep up the good work. Have a nice day.