I watch what he eats like a hawk because I know he'll pick up anything he can find. He is, after all, a dog.
I'm thinking he picked up a tummy bug similar to our "stomach flu" from those two young Siberian Huskies he was playing with all weekend. He had a slight fever while all this was going on.
I can say my brain was going all kinds of directions…is his Parvo up to date...did he swallow something that's obstructing him...going back in my mind to remember whether he'd eaten something off the ground... He gave me quite a turn, but I'm happy to say he's back to his old mischief today.