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I'll provide a couple of comments ........ please take them for whatever you think they are worth, remembering that I wasn't there when you took the photos, so I don't know the limitations you were working with when you snapped the shutter.
1. Nice shot. Eye was obviously the focus point, and you are drawn to it. Background is a bit distracting, but you select it and cut the saturation and brightness down a bit and correct that problem. I personally would crop in from the right side to geve a more dynamic composition. Overall, it's a good shot.
2. I personally do not like the second shot. Far too busy a composition for me. all the chair/table legs interfere with the dog's head, and somehow don't manage to act as "leading lines" to bring you in to the dog's head, which is where you want the focus to be. You did catch the eye in focus and the overall exposure is good, something that is sometimes difficult to achieve with a mostly black animal. Not one of my favorites.
3. I really want to like picture #3. The composition is nicely done, with the dog giving "the eye" to the viewer. Angle of head and slight downward viewpoint of the photographer all add to the composition. For me, however, it's simply too soft overall. I would have preferred to see more of the dog's head in focus (perhaps upwards of f/8), to include the nose of the dog. These days I shoot for the depth of field I want on the subject and then select the background in post-processing and soften it as needed. Perhaps that would work here. I like the crop and the colors.
4. Picture 4 is a possible winner for me. I would crop in from top and right quite a bit to convert it a horizontal format, brighten the squirrel, and again blur the background a bit and desaturate it. I like the story this tells with the birdfeeder and birdhouse and squirrel feeding.
Hope these comments are of use to you.