The images are rated from 1-5 Stars. 1 Star is the worst, completely out of focus and 5 Star is the absolute best, perfectly in focus.
You will notice that there are many images where the dog is completely out of the frame. This is due to the image lag within the viewfinder (EVF) where I would loose the dog due to images filling the buffer and blocking up the viewfinder. At six FPS this would happen towards the end of the burst. I would then just keep shooting, trying to predict where the dog was going to be. Nearly impossible as you can see. This actually worked better with the people/track athletes since they ran in a straight line and were not nearly as fast as even my slowest dog subject. You will also notice there are very, very few perfectly focused images here with the faster dogs. The AF just wasn't able to keep up with a running pooch.