#3 looks pretty good, but to improve the composition, crop the left side (and bottom) of the image where the dark area begins, right next to your dog's ear. (see attached image below)
Try to resist placing your subject in the center of the image, as in #1 & 2. If you don't know what the "rule of thirds" is, look it up. It's use will greatly improve your photos. This should be discussed in your camera manual. If you have selectable focus points, use them. This allows you to determine within what area of the sensor the focus will be concentrated; left, center, right, up, down, etc.
Also, the second shot in mixed light is hard to pull off with a good balanced result. The light on your dog's face is blown-out. Try moving your subject to full light or full shade.