@Coreyartus If you go to youtube, you can find lots of videos of horses that you can pause and study in any position. If you are using an iPad, you can take a picture of the still image and save it into Procreate so you can look at the picture right there.
I own 6 horses. The joints just above their hooves are the fetlock and pastern joints. These will compress/flex under the weight of the horse. The faster they run , the more the compression. In life, the tendons are stretched like a rubber band and the snap back helps propel the horse - part of why they can run so fast. A couple of your pix don't show any compression.
On horses, stylizing works fine on the top half but even if you are not going for realism, the picture will look off if the leg joints aren't fairly correct
. This picture of my horse, Java, shows it to the max. I would soften the angle a little bit in an illustration but it shows how the joint works.