I'm trying to improve my drawings but, I want to know if there is anything I need to improve on.

I think you just need to work on your anatomy and proportions.

The left front leg looks too short for the pose and the paw too big compared to the opposite front paw.
Also, the left back leg should be visible in that pose but you've not drawn it, so it looks like he's missing a leg.

Thanks, UK. It helps alot. good lord, I forgot the other leg.