Here are some possible reasons why your dog might be having blood in her urine:
* Urinary tract infection (UTI): This is a common cause of blood in the urine, especially in dogs.
* Kidney stones: These can irritate the bladder and cause bleeding.
* Bladder cancer: While less common, this is a possibility, especially in older dogs.
* Trauma: Injury to the bladder or urethra could cause bleeding.
* Hormonal changes: Postpartum changes can sometimes lead to temporary urinary issues, but blood in the urine should be investigated.
It is essential to take your dog to the vet for a proper diagnosis and treatment. They will likely perform a urine test, possibly blood work, and possibly imaging to determine the cause. The sooner you seek help, the better the chance of a positive outcome.