Experience....
Here are the pictures that you seemed to be suggesting didnt exist GVS, (I know you were just joking..hehe)...I have several more of this deer if you are interested. I also have several after he was harvested as well.
Interestingly enough, you will notice that the picture taken this day last year, (September 2nd), where the deer has the stomach problem we are discussing also showed up at the same exact time of year as the one pictured in the original post...I have littel doubt this is a coicidence....and also as I previously stated, based on my expereince having seen this before, the deer pictured in the original posts will be fine in a few weeks.
JC