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Luckily at this dose of ibuprofen (a 35 lb dog eating one tablet of 200mg ibuprofen), we are not likely to see any toxic effects. This is about a 12.5 mg per kg dose. For toxic effects on the kidneys we usually see at doses of over 175 mg per kg. We are far from that. We can sometimes see GI side effects (vomiting, diarrhea, nausea, anorexia) at doses of 25 mg per kg, but we aren't even to that point with your pup, so it is quite likely she will not have any negative effects from this ingestion.
If, however, your dog was on another type of medication that interacts with NSAIDs or if he had some underlying health issues, then it could be a concern and it may be recommended to induce vomiting with hydrogen peroxide.
I apologize, that last post was meant for another dog! There seems to be some glitches in the online system this evening!
Does your dog appear to have bruising on his skin?