4 images of the cat run loop animation, and 1 clip 
with a side view
Cool Cat! The animation is looking a tad stiff. Considering full speed the cat would throw it’s hind paws almost in front of the shoulder while the front paws are almost touching the tail root. The back is bend like a bow, the whole animal is throwing everything into that motion. The back works like a bow and the extremities follow through the entire range of motion. Those are FAST 8-). AND they LIKE IT!
Lemo
This copy I found on the web is going into the direction I try to point out:
Your model can do that!
Vaya, parece que está vivo. 
Lem, thx for ur advice. Let´s go for it.
Sí, Saltapiedras, ahora tiene que entrenar bastante…
Great
Very fine work and I love the animation…That cheetah is hauling @ss at rocket speed…
Que bueno, va teniendo muy buena pinta
ty ppl, i´ve done some fixing
That look much better! You’re getting there. If you take a close look at it, you can see that his back is curving in as if it would break soon. If you can, try and see if you can get it just the oposite way. You will instantly see the difference. Try to bend your back as far back as the cheeta’s (under medical supervision please) and you also see what I am refering to ;-).
small_orange_diamond
Lemo
ouch my poor old bones ache just watching that video dogbone!
I agree with lemo…you almost got it…keep going!
bending back the cat. this begins to look like a running cheetah
Nice movie! Jus one crit, a head of a cheetah is not going up and down so much while he is running.
bas, you are right
I agree w Bas. However you need to be clear on the cadence you’re after, If she’s running full tilt, both head and tail tend to keep real still and on the same plane while the body bows within. I think these are the details that make an animal like this seem so incredible to watch. Really nice work.
looks better now! keep going
following mr. bpmufx´s advice
ooops, sorry, zip file…
Just keeps gettin better
wow man, nice work, she’s haulin!