It would help to have a straight on picture of that wall from further away. I like what you've done on the right, could that be repeated on the left?

Your dog and home are great! I'd put an armchair (swivel, perhaps), pulled away from the wall and angled toward the sofa.

Another question why is the crown molding not at the ceiling?

Love the dog! I agree with hatetoshop. I would put a chair and floor lamp to the left of the fireplace.

lamp placement notwithstanding...... a small 'gallery arrangement' above the light switches would balance out the right side with slightly larger scale for the larger space. it would also cozy up a chair/lamp/table vignette....could include small mirror, metal work, paintings in small frames, etc.