If you have not already done so you should call your usual vet.
If your dog was my patient I would have him come in for observation. If necessary, I would induce vomiting and give supportive therapy: IV fluids, injectable gastro protectants, charcoal, etc.
Don't waste time! Take him to the vet.
So, I guess your plan is to wait until the vet answers, which could be about 20 hrs from now. Then, it might be too late.
DUHHHHH!!!!