I wasn't going to say anything, because I hate to be that person going around correcting people. But I saw that the photographer has posted another photo of the same animal, calling it a fallow deer. Sika deer, fallow deer... for the sake of educating people about exotic animals, it's an axis deer. Just trying to be helpful. As far as exotics go, axis deer are fairly abundant in Texas, where this photo was taken.
I have edited the title to reflect axis deer. I was misinformed first that it was fallow (same photo, just changed the title), then I was told it was a sika but now I'm reasonably certain it's an axis.