"The vet...

did say to not feed him tonight (which I didn't)
and to only give him about 1/4 of the amount of food he
usually gets tomorrow."

I'm no Vet -
but RE-read what I posted in your Previous Thread
about how OUR Vet does "upset tummies"...

FIRST Thing is they get *NO* food for 12 - 18 - 24 hours -
and sometimes one of the "Human" stomach remedies.

THEN - after the "Fasting Period" - they do NOT get DOG food -
it's Cooked RICE with either VERY well cooked & drained Hamburger
-or- Boiled Chicken with the rice.

And only a LIL bit - 1/2 CUP to start.

Don't remember WHO had it last - either Shadow (RB ) or possibly
Cinder - but we did Rice & Hamburg for at LEAST 3-4 days
before we went back to Dawg Krunchies.

ASK the Vet about trying "something" other than his regular food.

/s/ Phred