Poor Malone. I looked back & couldn't find a post stating what was wrong with handsome Mr. Malone. Sorry if I missed it.

Sometimes antibiotics can upset the stomach or cause a dog to act "off". I don't know how long he has been on them for but if it is the antibiotics you probably would of noticed something within a few days.

As long as he is drinking & eating some I'd probably give him a day before I brought him back to the vets. But I'd also call the vet to make sure that is a safe thing to do. Maybe the vet can offer some free phone advice about whats going on.

Good luck & I hope he feels better soon!