By Mary Drew at Pasty Central (Mdrew) on Saturday, September 29, 2012 - 04:29 pm:
For those of you that are saying both of Shadow's back legs are on the ground, explain to me what the appendage sticking out just under his rear end is then? That's his left leg, held in the upright position, bent at the knee (do dogs have knees?), with the lower part of the leg and paw pointing toward the ground.
Here's a photo with some arrows to help you see the leg upright.