For the black and white dog the main thing would be to crop them tighter, to remove distracting elements and dead space from the scene. Each will need a different crop and aspect ratio, so don't just stick with 3:2 or 2:3.
For the brown and white dog, in all honestly I would hit the delete key. Both have blown highlights in the fur. One looks very soft and the other looks slightly soft. Unlike the pictures of the black and white dog, the eyes of the brown and white dog are practically invisible and do not draw one closer. Because you have the shadow side of the brown and white dog in one of the pictures, apart from the softness, the picture looks flat and dull.
For the future, I would encourage you to get down lower, more on a level with the dog, so that you are not shooting down on top of them. Also, unless you are going for a very tight crop in the first place, it is a shame to just slightly cut off the ends of legs and paws. Normally it is better to leave more space in front of a creature than behind it. To chop off limbs while leaving a great vacant space behind the animal is not the best technique, IMHO. You can always crop them off in post, but if you don't capture them to begin with.......