Just went through this with Rudy. I know how scarey it is when they won't eat. Turns out he had gotten into a bag of pepperoni and pepperjack cheese. No diarrhea, just wouldn't eat. Vet gave us Flagyl. Well, he HATED that and wouldn't eat b/c of it. So if your dog is on that, make sure you wrap it in something so the taste doesn't get in your dog's mouth.
Once the flagyl was stopped, he went back to eating. I gave him boiled chicken and hamburger for a few days, and Pepcid AC. Little rat, wouldn't eat without the chicken for an extra week.
In fact, it's been three weeks and I am about to cook him some chicken for tomorrow morning............
Glad you got to the bottom of it and it was nothing terrible.
I got a dog for my husband. It was a good trade.
LILLY and RUDY
In Memory of MADISON, The King 12/89-6/04
In Memory of JAKE, The Perfect Dog 9/01-11/02