At least you tried.
However, 'using my mouse' is not an legit excuse. There is alot of things 'wrong' here. The front legs look like they have been sawn together. The leg further away should be smaller then the one closer to the screen. If they are the exact same size they look like they are next to each other. The same thing goes for the backlegs. If it wasn't for that shading, the leg closer to the screen would look like it was behind the further away leg.
There are alot of other things to go into deep with. But still, you tried. And that makes you better then anyone that hasn't. There are good things about this as well! I have seen muuuch worse! I say, listen to the advice the others gave given you and keep on drawing. Good try! Hope to see you again! :)