Hello there! I don't see much of a problem with the legs, since you can simplify the legs of any animal using simple cylinders. :) What I wanted to correct was the construction of the body. It's not that your construction is wrong, but these three basic forms are commonly used when drawing four-legged animals, whether they're felines, canines, etc. The construction is usually the same. I also think these forms are better for working out the perspective before drawing more complex shapes. P.S. I don't usually draw animals, so the proportions are probably not entirely accurate, hehe. Hope this helps!