My dog has thrown up twice today along with very watery, bloody liquid coming from her rectum. She is not dehydrated and doesn''t have a temperature. She has had 2 doses of Previcox one on Fri. and one on Sat. night. We took her to the vet this morning and the vet was just going to give her a s.q. shot for dehydration along with, an anti nausous drug, and something maybe for diarhea. Now it''s 4:15 p.m. and I am worried about her loosing too much blood. Can you please help me? Is it from the Previcox? It seems like these are direct side effects from the drug.