This is a link to the Previcox Information Sheet that should be given to dog owners when medication is prescribed
http://www.fda.gov/cvm/Documents/N141230cis.pdf
Previcox is not recommended for dogs under 12.5lbs so it really shouldn't have been prescribed to Tatum to begin with. Also, diarrhea is a side effect of Previcox so most likely the diarrhea she had today is because of the medication.
Are you planning to have Tatum's surgery done at Texas A&M?
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.