Just kidding, I've seen and heard of much worse. Was it human or dog poop? I'd be concerned about both for different reasons. I would put him on a probiotic to help fight bad bacteria, keep him really hydrated, and watch for signs of GI complications/infection. Chances are he's going to be just fine.
Maybe post this in the health and healing forum to see if you should take any precautions.
Oh yeah! About two weeks ago, dd ate her own poop after waking up for her nap. I thought she was playing in her crib, but she was really finger painting. It's possible she got some in her mouth, but it might have been the last thing she did before she started crying. I wasn't concerned though, 'cause it was her own.