1) Dog's paws cropped off--that really hurts this. Compare the feeling the cropped-off paws gives as opposed to the feeling of wholeness we see in #2, where the paws are completely shown....makes a big difference.
2) Good placement of the dog's entire body and all four legs as to the height within the frame, but it needs a wee bit more space to "look into" on the right side. I wish the camera had been 2 feet over to the right, and that the tail was not hacked off. Still, better than shot #1 I think.
3) Not bad. Good light, classic contre-jour shot. Nothing great, nothing horrible. Shows good attention to LIGHT and subject.
4) Ugg. Very weak image. OOF camp chair in background, dog shown oddly, looking out of frame, weird processing, strange horizontal camera orientation. Not sure what this is a picture "of".