I overfed my dog, what do I do?

I overfed my dog over the past few days, unintentionally. He was acting hungry and I didn't think a little extra food would hurt him. (I already learned my lesson though!) He's now pretty bloated. He's only been like this today, maybe a little yesterday. He's acting normal, no sign of pain or sickness. But his stomach seems pretty darn large; uncomfortably large. He was not fed anything other than dog food. Should I feed him less than I normally should until it goes down? Or feed him as normal? He's such a small dog that this worries me. (A 1 lb, 9 week old chihuahua/terrier mix.) I can't afford to take him to the vet unless it's absolutely necessary, so what signs should tell me to take him to the vet? Diarrhea, burping? He hasn't shown the signs, but I want to know what to look for. Advice is appreciated!