The vet said blood in your dogs urine not a urinary tract infection so what could it be?

If your dog's urine contains blood (hematuria), and the veterinarian has ruled out a urinary tract infection, there are several other possible causes. Here are a few things it could be:

Kidney disease: Kidney disease can cause damage to the kidneys, leading to blood leakage into the urine. Symptoms of kidney disease may include increased thirst, frequent urination, vomiting, and lethargy.

Bladder stones: Bladder stones can irritate the bladder and cause bleeding. Symptoms of bladder stones may include straining to urinate, painful urination, and frequent urination.

Tumors: Tumors in the bladder, urethra, or kidneys can also cause blood in the urine. Symptoms of tumors may vary depending on the location and type of tumor.

Trauma: Injuries to the urinary tract, such as being hit by a car or falling from a height, can also cause blood in the urine. Symptoms of trauma may include pain, swelling, and bruising in the area of the injury.

Certain medications: Some medications, such as aspirin and certain antibiotics, can cause blood in the urine as a side effect. If your dog is taking any medications, talk to your veterinarian about whether they could be the cause of the blood in the urine.

Inherited conditions: Some dog breeds are predisposed to certain conditions that can cause blood in the urine. For example, Dalmatians are prone to a condition called hyperuricosuria, which can lead to the formation of bladder stones and blood in the urine.

It's important to have your dog evaluated by a veterinarian to determine the cause of the blood in the urine and receive appropriate treatment. Some causes of blood in the urine can be serious and require prompt medical attention.