Woke up this morning and Walter(12 weeks old) was whining and very restless (normally he is still sound asleep). He had pooped in his pen and it was very runny. Took him outside to do his business, once we came back in he normally goes to town on his food and water but didn't touch either. I noticed that his butt was bleeding a little bit. What is going on here? I'm guessing he ate something too big for him to pass? What do I do?