My 14 yr old boxer is taking Proin for two weeks, just noticed a couple hours ago he was just have a few drops coming and stood there for several minutes trying to pee and a drop here and there came out. My husband just took him for a walk because the same thing was happening to him when he wanted out to try and pee again. He noticed that he had blood in his urine, this is new. Is the medication causing this? He was put on Proin and an antibiotic two weeks ago with only one week of antibiotics and a whole bottle of Proin for incontinince. What should we do?