what's the problem with putting art on deviantart?
Nothing, really, except you're furthering the stereotype that deviantArt is filled with nothing but poorly drawn foxes, wolves, etc.
As for actual criticism, you should work on your basic fundamentals a bit more. eg proportion, line quality, general composition, blah blah blah.
For example, the proportion on most of the drawings are a bit off (length of dog, head on the fox, legs/eyes on cat.) Generally, a better understanding of proportion will come with a better understanding of your subject matter, so study up on the different animals or whatever you want to draw. Anatomy isn't a bad place to start, especially in this case, as it was difficult to tell what some of the characters were. (The fox doesn't look like a fox, and the cat looks more like a dog.)
As for line quality, the lines should be smoother (and anti-aliased, lol) and more confident looking. A nice trick is make the lines bigger than they need to be and erase away the excess, so you're able to get more confident strokes. (That's assuming you're using a tablet; if not, make use of the line/pen/curve/circle tools more often.)
Oh, and try and go for more dynamic looking pieces instead of the same side-shot every time.
