Thank you! Tbh I have no idea how I got the proportions right so quickly, and I all of a sudden got good at drawing cats just recently, but I with animals I make sure to draw the line of action, rib cage, limbs and all that just like with drawing people. With most animals or at least cats, also make sure to focus on the arch of the spine. I noticed that helps it look more life like a whole lot.
sorry, that's all I have, hope it helps!