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  Rocco had Rimadyl after his teeth cleaning, and it can cause a sleepy, lethargic dog.  Rocco was on 25mg, then they were broke into quarters (he is 6lbs).  It's used for pain and as an anti-inflamatory.  I am sure by now you have spoke your vet, if you haven't, call and see if you can half the dose you are to give.
 Best wishes to Frodo<3
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