All Dog Breeds: I have a 3 year old boxer that started bleeding when she urinates today. No... I have a 3 year old boxer that started bleeding when she urinates today. No... ================================================================================ admin on 29 April, 2007 06:00:00 I have a 3 year old boxer that started bleeding when she urinates today. No other symptoms, but seems to be urinating more than normal.