Give your vet a call, explain to him/her what happened and have them tell you what you should do. If your dog ingested that medication yesterday morning, I'd say your dog should be fine, but I would still call your vet office asap.
What is the effect of OxyCOTIN on dogs? The time release pill that has no other ingredient in it? I take this medicine and fear that my 6lb Chihuahua may have ingested one yesterday morning. She has diarrhea now but otherwise has been fine.