It's kind of hard to make judgements about an image when it's already been edited and we have no idea what has been done and by how much. The dog is perhaps a little overexposed and perhaps the WB is a little off. Either problem could be corrected in camera or with a little post processing.
What was the lighting for this? I see a couple of catchlights in the eye, and the EXIF says no flash, but I'm curious to know what the lighting was. Having to go to 6400 ISO doesn't seem optimum for a "portrait". You also used shutter priority with evaluative metering, but no sign of exposure compensation that I can see - yet you're shooting a (near) black subject against a background of God only knows what shade, since you've edited it to pure white. Odds are, IMHO, that your exposure is relying, at least a little, on a wing and a prayer to get it right, more or less, and it's not quite worked. Personally I'd be using manual exposure, possibly chimping a test shot or two, and locking the exposure once correct, so that small adjustments to subject stance or framing did not affect the exposure further.
As for WB you appear to have left it in Auto mode. Again, without seeing the true colours of the surrounding scene, or knowing what the lighting was, I wouldn't like to guess what the WB setting should be, but it's no certainty that Auto would get it right. My approach, personally, would be to shoot in raw and simply adjust the WB in post until I achieved the desired appearance, which might not necessarily be a completely neutral balance. Others might well prefer to set a custom WB prior to shooting, and that's cool too, but Auto? Might work. Might not.
I've had a little tinker with your photo in Lightroom, and I think I've got it looking roughly as one might hope, but as you have image editing disabled I won't repost it here without your permission.
There's another "black dog" thread here -
http://photography-on-the.net/forum/showthread.php?t=664494 - which is not about shooting against white, but might give you some points to consider.