Ein gave us a clue today to what has been causing all of his intestinal problems. He finally went #2 and for one reason or another, the thought entered my mind, "Let me take a look and see if there's any evidence that he's been eating acorns or something like that." I'm so so so very glad that I did. I saw something that I thought looked like an acorn cap and fished it out with a stick. Definitely not an acorn cap. Put on some rubber gloves and grabbed the paper towels.
Ein passed something wider than my thumb and about almost as long. It's curved and I can't figure out what it is. Bone? Rock? Wood? Seems too thick to be rawhide.
I have no clue if this is it or if there's more but the vet's office doesn't do xrays on Saturdays, so unless he gets really sick, we're going to take a wait and see approach. If he gets sicker, we'll take him to the emergency animal hospital.
I'm so glad the we finally have an anwer, or at least part of one. Now if he keeps getting sick, we know what step to take next.