This is a lovely portrait! I know my dog hates that tub, and this one looks miffed as well! Nice subtle lighting goes well with the white background and tub and the color of the dog as well. 7
This has such 'aawwww' factor. The poor doggie looks like he is imploring for you or someone just off the the side to "please take me out and dry me". Good focus for we see some really nice details in the long and wet hair of the dog. Pose again is good (especially the tilt of the head where we see the eye) for it is very emotive. I have this as an above average shot but it could more into the exceptional category if you bump up the contrast a tad more so that your B&W tones become more dynamic. I think you did a good job in the framing but there is one little detail that would have made this even better. I think the impact of the dog being in the tub would be even STRONGER if you had included the curve of the tub on the left hand side...mayhap even adding a bar of soap to cement the imagery of bathtime more solidly. Lastly just a small critique, but if you cropped a little more from the right side you would remove the glare seen on the back bathtub wall.