Took our dog to the vet the other day because we noticed blood in her urine. The vet really gave us no answers. We now have her on prendisone, doxycycline & azthaioprine because the vet thinks it may be an autoimmune infection. But she really has no answers for us. Has anyone ever had this happen to their dog before or have any advise on what might be wrong? She is not weak, she wags her tail, still wants to go on walks. We are just mind boggled!!