All in all you've got some really nice shots here, though they all seemed to be pretty similar in composition. In most of these it looks like your subject is centered - other than the cow, and the cow seems to have one of it's ears partially cropped off.
I think #5 has the most potential but it looks like maybe you added some vignetting in post processing, which I guess for me just really doesn't work for the shot since the dog's fur is black to begin with and it sort of dampens the contrast between the dog an the background. If you were to get rid of the vignetting, and frame it so the dogs face is a little closer to the left and toward the top of the frame I think this would be a very exceptional shot.
I'd recommend some reading on composition, particularity the "rule of thirds", I think it will help a lot with your framing.