The reasons why dogs end up peeing with blood are:

1. Urinary tract infection: Urinary tract infection is a common dog health problem, especially more common in female dogs. The infection may cause your dog to experience pain when urinating and blood at the end of the urination.

2. Urethral stones: Urethral stones are another common cause, especially in male dogs. is more common in . Stones can irritate your dog's urethra, causing pain and bleeding.

3. Kidney disease: Kidney disease may cause urine to become cloudy and blood to appear.