Tangle, a cocker spaniel, attempts to sniff out bladder cancer from a patients’ urine, in this image made available in London, Thursday Sept. 23, 2004. Six dogs were trained to pick out urine samples of patients with bladder cancer from those of people with other diseases and healthy individuals, in a new study published in the British Medical Journal. (AP Photo/pa-ho) ** UNITED KINGDOM OUT: MAGS OUT: NO SALES: **