Marco is our paraplegic cat, weighing 10 pounds, about 2 years old and was injured when he weighed a half pound. My husband expresses his bladder twice a day (at least), sometimes with medication to help relax the sphincter. All of a sudden nothing works. It won't squeeze. He squeezes and squeezes only to get a couple drops. Marco is leaking all the time because we can't express his bladder. Any ideas? The vet says there's no infection and gave us different medicine to try, but nothing is working. Please help.