Here are some possible reasons why your older female dog might have blood in her urine, but remember: This is not a complete list, and self-diagnosis is dangerous.
* Urinary tract infection (UTI): This is a common cause, especially in older dogs, and can be treated with antibiotics.
* Kidney stones: These can cause pain, blood in the urine, and difficulty urinating.
* Cystitis: Inflammation of the bladder, which can be caused by infection or irritation.
* Tumors: Sadly, tumors in the urinary tract are possible, and require prompt diagnosis and treatment.
* Prostate problems: While this is more common in male dogs, it can sometimes affect females.
* Hormonal changes: Hormonal changes associated with aging can affect the urinary system.
Please don't delay: Schedule a vet appointment as soon as possible. Early diagnosis and treatment are essential for your dog's health.