Urinary tract problems in horses are not common. However, horses can occasionally be affected by these types of conditions, so it’s good to be aware of their symptoms. If left unchecked, urinary tract problems can lead to severe illness.
The horse’s urinary tract includes the kidneys, ureters (tubes that connect the kidneys to the bladder), the bladder, and the urethra. It has several important functions including:
- Disposing of waste products
- Maintaining correct balance of water and electrolytes in the body
- Producing the hormones erythropoietin and renin, which are important in maintaining healthy blood pressure, the production of blood cells, and absorbing salt correctly
- Processing vitamin D to its active form
When horses develop an infection in any part of the urinary tract, it is usually caused by bacteria. An infection can develop on its own, or it could be the result of a problem in the urinary tract such as obstructive stones.
Most healthy horses do not develop urinary tract infections. However, some horses are at increased risk. This would include horses that have urine flow problems, overly diluted urine, sugar in the urine, as well as aged horses or those have a weakened immune system or other disease.
Below are the three most common types of urinary tract infections seen in horses.
Bladder Infection
Infection or inflammation of the bladder is known as bacterial cystitis. It is usually caused by an obstruction in the urinary tract or paralysis of the bladder, which could result from nerve damage. Bladder infections can also occur in mares with chronic inflammation of the vagina.
Symptoms of a bladder infection include:
- Loss of control over urination
- Frequent urination
- Urine dribbling
- Urine scalding
- Straining to urinate
- Blood in the urine
If nerve damage is the cause, there may also be paralysis of the anus or tail.
Kidney Infection
Kidney infection is known as pyelonephritis and it involves inflammation of the kidneys. It is usually caused by a bacterial infection in the urinary tract that moved up into the bladder and then the kidneys. Stones in the kidney or ureter are a common cause.
Signs of a kidney infection in horses include:
- Pain in sides, especially around the kidneys
- Fever
- Weight loss
- General sense of not feeling well
- Excessive thirst
- Excessive urination
Interstitial Nephritis
Interstitial nephritis also involves inflammation of the kidneys, and it usually results from bacterial infection. Infectious disease that affects the blood vessels can spread and become interstitial nephritis.
Symptoms include:
- Frequent urination
- Straining to urinate
- Discolored or bloody urine
- Discomfort or pain during urination
- Fever
- Swelling or inflammation of the kidneys
- Pus in urine
It’s important to note that this condition can be serious and lead to kidney damage or failure, so always involve your veterinarian if you suspect it.
Cranberry Powder for Urinary Tract Problems
To support your horse’s urinary tract health, we recommend supplementing Cranberry Powder. This natural product is a powerful antioxidant that helps to support both the urinary tract and the immune system. Cranberry powder is a natural urinary acidifier that can help to prevent alkaline urinary calculi (stones). It also has anti-bacterial properties and helps maintain proper urinary pH.


