^ This. A 50mg tablet given twice (or 3 times) per day is a dosage I've seen prescribed very often for dogs, based on their weight (and I'm not talking 200-lb Giant breeds, either!) Hopefully that helps relieve some worry, along with MK's post. This dosing doesn't automatically sound alarmingly high to me, though I'm also assuming you don't own a half-pound Chi puppy.
I'd follow the vet's dosage instructions. If on that prescription, you think your dog is too sleepy or still in pain, then definitely consult the vet. There may be other options for dosing or even for the type of medication.
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