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Blood can appear in a dog’s urine at any age, but age can be a good indicator of the cause. For instance, dogs can suffer from familial hematuria, which means that blood in the urine is hereditary, and this is the most common cause for blood in the urine of young dogs. However, the most common cause of blood in the urine of an older dog is cancer. Another indicator can be gender because the blood in the urine may be caused by a urinary tract infection, from which females are more likely to suffer than males.
Blood in the urine is a condition medically referred to as hematuria. Blood in the urine is a symptom that can indicate various underlying causes, some of which are very serious. These include cancer (commonly in: older dogs), familial hematuria (younger dogs), and urinary tract infections (females).