Wondering if these are the same hog? One looks longer than the other, it may just be the way he is standing, but if it is the same hog, he spent over 5 hrs in the pen last night. This pen is right next to a tank on the farm, they like to wallow in, so he could have been drying out causing the change in coloration.
I have pictures of him from 10:30ish last night until after 4ish this morning. There was a gap of about 30 minutes, he entered the first time from the left and the right the second time. Tank is to the left. Goal is to ground check him or both this weekend.