My dog may have consumed ant poison-help!?

Take him to an emergency vet NOW. Yahoo answers is not going to give you any kind of reliable medical advice. Regular vets offices may be closed, but there is always a 24 hour emergency vet somewhere. If your dog is poisoned, he probably won't make it until morning. If he does, they probably wouldn't be able to do much for him at that point. He needs to have his stomach pumped and fluids started ASAP.