My guinea pig just bled and peed out almost a sand like substance. I do not know what to do.... I thought she was better and a week later i found dots of blood in her cage. Do you know what this would be?
You should take your guinea pig to the exotic veterinarian for exploration. It can have various causes, such as a wound in the area, problem in the uterus, bladder and kidneys (infections of the urine or the womb). They are usually uterine problems that require urgent intervention, but you have to diagnose them beforehand.
Be very careful because rodents, when they smell blood in their body, self-mutilate the area, so never leave any traces of blood stuck to the skin.
All the best,