HI this is DRB and I would be happy to assist you with this. If you gave your dog 1/10 of a standard 200 mg tablet that would be 20 mg and you probably will be ok .....see chart below:
Ibuprofen Dose and Associated Signs or Outcomes in Dogs* Dose Associated Signs or Outcomes
25–125 mg/kg Vomiting, diarrhea, nausea, abdominal pain, anorexia
> 175 mg/kg All of the above plus hematemesis, melena, polyuria or polydipsia, oliguria, uremia, acute renal failure
> 400 mg/kg All of the above plus seizures, ataxia, coma, shock
> 600 mg/kg Death *Source: Adapted from Villar, D. et al.: Ibuprofen, aspirin and acetaminophen toxicosis and treatment
So your dogs dose was well below even the top dosing so likely she will be fine but do not give Ibuprofen to your dog again as it can be very toxic and has very narrow range of safety not to mention that it can cause gastric or stomach ulcers.
If you have additional questions let me know. SIncerely, DRB
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