Zeke was looking a little bloated after dinner last night, and had a mild concern that he could have a blockage. Didn't feel anything, and he was acting normal.
Come midnight, and he's wanting to go out. Not unusual, he drinks a lot of water. But it was unusual when he wanted to go out again a half hour later. And then another hour later. And on and on. Then I hear him wretching. He wants to go out again at 4, and I knew something strange was going on. I see where he vomited up a little bit of bile, and there are several bright red spots in the bile. He did that again before 6. At 6, I let him out, and it was literally like a fire hose had erupted from his back end. I checked the stool, and it looked like there could be some blood in it, but not certain.
Took him in to the vet as soon as I could this morning, but just had to drop him off till they could see him. He was pretty lethargic at that point. He's only 6 years old.
Update: Looks like Zeke's got hemorrhagic gastroenteritis. It's serious, but was caught early and aggressively. Still waiting to see if he'll be able to come home, or if he is going to have to stay overnight. No real known cause.