To Sherman Dorn: Blood in the ruine does imply a bacterial infection in female ferrets, unless she is intact. Were there any more abnormalities on the urinalysis? Was blood taken for examination. I agree with the antibiotic therapy. Far too often urinary tract infections go untreated and you end up with a raging kidney infection which may be life-threatening. I would stick with the antibiotics for at least a week and then re-revaluate. I don't think that ultrasound is indicated now. Best of luck, Bruce Williams [Posted in FML issue 1065]