Thank you all for the thoughts and prayers. Titus is doing excellent today. He is eating and drinking, and he was even up for some tug-of-war (his most favorite game) early this afternoon!
Yeah, the vet believes that he just ate something that he was not supposed to. That silly, guy! He's very mouthy...when he gets really excited, he'll leave the room just to get something to put in his mouth. Then, mouth occupied, he re-enters the room and resumes his excited-ness.
In short: rest easy, all. Crisis over!
And thanks again!