Blood in Pig Urine: Possible Causes & When to Call a Vet

Blood in a pig’s urine is called hematuria. In pet pigs, the most common urinary causes are bladder inflammation or infection (cystitis), kidney infection, and urinary stones or crystals. Merck notes that cystitis and urolithiasis are common in miniature pet pigs, and urinary stones can cause pain, straining, blockage, and blood in the urine. In production pigs, a well-described cause of hematuria is the porcine cystitis-pyelonephritis complex, which can involve severe bladder and kidney infection.

Urinary stones deserve special attention because they can move into the urethra and block urine flow. That risk is often higher in males because the urethra is longer and narrower. A blocked pig may strain repeatedly, pass only drops, or stop producing urine altogether. This can become life-threatening quickly.

Other possibilities include trauma, irritation from inflammation, kidney disease, or blood coming from somewhere other than the urinary tract. For example, discharge from the reproductive tract can sometimes be mistaken for bloody urine. In some cases, urine dipsticks can also read positive for blood when the pigment is coming from hemoglobin or muscle breakdown rather than active bleeding, which is one reason your vet may want a full urinalysis and microscopic exam.

Because the list of causes is broad, the color alone does not tell you what is wrong. Red, pink, brown, or rust-colored urine all warrant a veterinary exam, especially if your pig also seems painful, tired, dehydrated, or off food.

See your vet the same day if you notice blood in your pig’s urine, even if your pig still seems fairly comfortable. Urinary infections can move upward into the kidneys, and stones can irritate the bladder before causing a full blockage. Early care may be less invasive than waiting until your pig is very sick.

See your vet immediately if your pig is straining to urinate, producing only a few drops, vocalizing, standing hunched, has a swollen or painful belly, seems weak, will not eat, or has cloudy or foul-smelling urine. Merck specifically notes that urinary calculi can block the tract and that this is an emergency in potbellied pigs. Severe cystitis-pyelonephritis can also lead to acute kidney failure.

Home monitoring is only reasonable while you are arranging veterinary care, not as a substitute for it. If you are unsure whether the blood is truly in the urine, try to collect a fresh sample from a clean surface and take clear photos or video for your vet. That can help distinguish urinary bleeding from vaginal discharge, rectal bleeding, or staining from the environment.

Do not give leftover antibiotics, pain relievers, or human medications at home unless your vet specifically tells you to. Some drugs are unsafe in pigs, and the wrong treatment can delay diagnosis or make kidney problems worse.

Your vet will start with a physical exam and a careful history. Expect questions about when the bleeding started, whether your pig is straining, how much urine is coming out, appetite changes, water intake, recent trauma, and whether the blood could be coming from the reproductive tract instead of the urinary tract.

A urinalysis is usually one of the first tests. VCA notes that blood in urine is associated with problems such as bacterial infection, bladder stones, trauma, or cancer, and that further investigation is recommended when blood is present. Your vet may also recommend a urine culture to look for bacteria. In pigs with suspected cystitis-pyelonephritis, culture helps confirm infection, although some organisms require special handling.

Many pigs also need bloodwork to assess kidney function, hydration, and inflammation. If your vet is worried about stones or obstruction, they may recommend x-rays, ultrasound, or both. Imaging can help show bladder stones, kidney changes, retained urine, or signs of a blockage.

Treatment depends on the cause and severity. Options may include fluids, pain control, antibiotics chosen by your vet, catheterization or decompression if there is obstruction, hospitalization, and sometimes surgery to remove stones or relieve a blockage. If the bleeding is not truly urinary, your vet may shift the workup toward reproductive, gastrointestinal, or clotting causes.

Home care should focus on observation, comfort, and getting veterinary help promptly. Keep your pig in a clean, dry, easy-to-watch area with good footing and easy access to water. Track appetite, water intake, urine frequency, urine color, and whether your pig seems to strain or cry out. Photos or short videos can be very helpful for your vet.

If your pig is still urinating, encourage normal drinking unless your vet has told you otherwise. Do not force large amounts of water by mouth if your pig is weak, nauseated, or not swallowing normally. Offer normal food unless your vet advises a temporary change. Reduced appetite, hiding, or reluctance to move can all be signs that your pig is feeling worse.

Keep the bedding clean so you can tell whether fresh blood is still appearing. If possible, collect a fresh urine sample in a clean container or from a clean, non-absorbent surface. Refrigerate it if your vet instructs you to bring it in, but fresh samples are usually best.

Avoid over-the-counter pain medicines, leftover antibiotics, herbal products, or urinary supplements unless your vet specifically recommends them for your pig. The safest home plan is supportive care plus timely veterinary follow-up, because urinary bleeding can shift from mild to dangerous faster than many pet parents expect.