Check out these all about animals images:
The A B C's of animal structure
Image by aaipodpics
In "How To Draw Animals" by Jack Hamm, he teaches us to draw animals in side view with a bunch of rectangles. It isn't about the rectangles, but about having a way to see the structure of the animal, of all four legged animals, and apply that knowledge to a specific animal. That way you have to guess less and can draw more. The more you draw, the better you will get, especially if you pay attention to how you draw.