Hi,
You can read more about tramadol and it's dosage, based upon weight, plus adverse reactions, here:
http://www.petplace.com/drug-library/tramadol-hydrochloride-ultram/page1.aspx
As you can see, the recommended starting dosage
in dogs may be 1 mg per pound (2 mg/kg) every 12 hours, but you should never give a medication to your dog without first consulting with your vet, especially if she is already on another analgesic medication, like Previcox.
http://www.petplace.com/drug-library/firocoxib-previcox/page1.aspx
I hope she's feeling better very soon!
Cher
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