My dog is determined to keep me in a state of low-grade panic

He spent last night at the emergency vet clinic following an early-morning gastrointestinal upset too revolting to post.* He'd been off-colour for a couple of days, but naturally Sunday (when my regular vet is closed) was the day he chose to produce the really spectacular symptoms. He was a bit dehydrated, so I left him there for rehydration and blood work (just in case it was one of the less likely but more ominous options, such as pancreatitis or poison) at vast expense to the management. According to the vet I spoke to today, he is much better, also (I quote) "a lovely dog, very active, which makes physical exams a challenge because he's a moving object. But a lovely dog." And he's been eating, no problem so far.

*although of course I will if anyone really wants to know, because my life is ALL about the revolting symptoms!