Hello, I am Dr. Peter a licensed Veterinarian. I would like to help. I need to ask you a few questions to be well informed and give you the best advise. There is no additional charge for information request.
1- How long has it been since he ingested the medication?
2- How much does your dog weigh?
3- Do you have hydrogen peroxide?
1. 15-20 minutes
2. 65 lbs.
Well, Ropinirole works as a dopamine antagonist, I would expect that it could have potential hypotension (decrease blood pressure), which you can see as weakness, lethargy, etc. The half life of Ropinirole is 6 hours, so, if you see any of these symptoms or anything else that would be abnormal, have him checked by ER vet immediately and the vet can treat according to findings. If after 12 hours you notice no problems, then most likely he will be ok, at that point most if not all of the medications has been metabolized; give him plenty of water or low sodium chicken broth to increase urination.
If you have additional questions I will be glad to answer them.