It is precisely when you think you have seen it all, that in fact you will find out that is simply not true. Such was the case when I got a report from one of the grooms that they had found some blood in the shavings when cleaning the stall of a 3-year-old filly. Careful inspection of the filly showed no obvious injury or source of the blood. She was eating fine and her behavior was normal. She was being worked daily and her workouts seemed to be going well. The amount of blood was not extreme and the plan was to just keep an eye on her. A few days later, the trainer reported that the filly had a reddish tint to her urine when she came back to her stall after the workout.
After that, the reports varied. Some days, the filly’s urine looked fine, other times, it appeared reddish in color. All of her vital signs continued to be normal. If this filly was in fact, having blood in her urine, what could be causing it? The
