Pet ultrasound in San Jose
& Campbell, CA

Abdominal ultrasound uses a small probe and sound waves to produce live images of the organs inside your dog or cat's belly. Because it shows soft tissues in detail — far more than a standard X-ray — it's one of the most useful tools for investigating symptoms that don't point to a single clear cause.

During the scan, the probe is gently moved across the abdomen while your pet lies on a table. A thin layer of gel helps the sound waves travel clearly. The images appear on a screen in real time, allowing the veterinarian to evaluate organ shape, size, texture, and blood flow as the scan progresses.

Abdominal ultrasound is commonly recommended for pets experiencing unexplained weight loss, chronic vomiting or diarrhea, increased thirst or urination, belly pain, or a palpable mass. It's also used to monitor known conditions and guide procedures like fine-needle aspirates when a specific area needs closer evaluation. While ultrasound provides valuable information, it is often used alongside bloodwork, X-rays, or other diagnostics to build a complete clinical picture — no single test answers every question on its own.

The liver sits in the upper abdomen and is involved in metabolism, detoxification, and bile production — so changes here can affect your pet's overall health in significant ways. Ultrasound gives us a detailed look at liver size, shape, and internal texture that bloodwork alone cannot provide.

During a scan, we evaluate whether the liver appears enlarged or shrunken, whether the tissue has a smooth or irregular pattern, and whether blood vessels within the liver look normal. Small nodules or diffuse changes in tissue density may be identified, which helps guide whether additional testing like a biopsy or aspirate is warranted.

The gallbladder — a small organ that stores bile — is evaluated at the same time. Ultrasound can detect gallbladder sludge (thickened bile that hasn't fully emptied), gallstones, or wall thickening that may suggest inflammation. These findings don't always indicate a serious problem on their own, but when combined with your pet's symptoms and blood results, they help your veterinarian form a more complete assessment and recommend appropriate next steps.

The kidneys filter waste from the blood and play a central role in fluid balance, so changes here can develop quietly before symptoms become obvious. Ultrasound lets us look at kidney size, shape, internal structure, and blood flow — helping detect issues that bloodwork alone may not fully explain.

Both kidneys are evaluated for symmetry, as one kidney may enlarge or shrink before the other shows changes. We look for differences in tissue density within the kidney itself, which can suggest cysts, stones, or areas of inflammation. In older pets, kidney changes are relatively common, and ultrasound helps determine whether what we're seeing is age-related or something that needs closer attention.

The urinary bladder is examined at the same time. Ultrasound can reveal bladder wall thickening, which may indicate chronic irritation or infection, as well as stones or mineral sediment that X-rays sometimes miss — particularly small or less dense stones. If your pet is straining to urinate, producing blood in the urine, or having repeated accidents, bladder imaging is a practical starting point. Findings from the scan help guide whether antibiotics, dietary changes, or further investigation is the right next step.

The spleen is a blood-filtering organ located on the left side of the abdomen. It can become enlarged for a variety of reasons — infection, immune-mediated conditions, or simply as a response to another process happening elsewhere in the body. Ultrasound helps us see whether the spleen is larger than expected and whether the internal structure looks uniform.

In some cases, ultrasound may reveal a focal mass or nodule within the splenic tissue. Not every splenic mass is malignant — benign growths like nodular hyperplasia are common in older dogs — but identifying and characterizing a lesion helps determine whether a fine-needle aspirate, biopsy, or additional testing is appropriate.

Splenic changes are sometimes discovered incidentally during a scan done for another reason, while other times they follow the detection of a lump during a physical exam or unexplained changes on bloodwork. The information ultrasound provides about size, shape, and internal appearance gives your veterinarian a more informed basis for discussing next steps with you. In many cases, the findings are manageable — but early detection makes a meaningful difference in how options are approached.

The gastrointestinal tract — from the stomach through the small and large intestines — is difficult to evaluate thoroughly with X-rays alone because soft tissues overlap in the abdomen. Ultrasound provides a clearer look at the wall of each segment, the space inside, and whether the intestines are moving normally.

During a GI ultrasound, we assess wall thickness at multiple points along the tract. Thickened walls can suggest inflammatory bowel disease, infection, or other conditions that cause chronic digestive symptoms. Thinned or disrupted walls may raise concern for ulceration or perforation. Normal motility — the rhythmic contractions that move food through — is evaluated as well, since abnormally slow or fast movement patterns can contribute to vomiting or diarrhea.

Ultrasound is also useful when a foreign object is suspected. While X-rays are often the first step in detecting swallowed items, ultrasound can identify soft-tissue foreign bodies that don't show up as clearly on radiographs, and it can assess whether the intestinal wall around the object is becoming compromised. For pets with ongoing gastrointestinal symptoms that haven't responded to initial treatment, ultrasound provides a closer look that helps guide whether a dietary change, medication trial, or further investigation is the best path forward.

Discovering a mass in your pet's abdomen can be worrying, and for good reason — but the first step is always to understand what we're looking at. Ultrasound is often the most practical way to get a closer look without surgery, showing us where the mass is, how large it is, and what it appears to be made of.

During the scan, we evaluate whether the mass appears solid, fluid-filled, or mixed — which helps narrow the list of possibilities. We note which organ or tissue it seems to arise from, whether it has a defined border or appears to blend into surrounding structures, and whether it seems to be affecting nearby organs or blood vessels. All of this information shapes the conversation about next steps.

Depending on what the scan reveals, your veterinarian may recommend a fine-needle aspirate — a quick procedure where a thin needle collects cells from the mass for microscopic evaluation — or a biopsy for a larger tissue sample. In some cases, serial ultrasound monitoring is appropriate if the mass appears low-risk. It's important to understand that while ultrasound provides valuable characterization, it does not replace histopathology for a definitive diagnosis. The goal is to gather enough information to make informed decisions together about your pet's care.

Free fluid in the abdominal cavity — sometimes called ascites — is not always visible on X-rays, particularly when the amount is small. Ultrasound is far more sensitive for detecting even modest accumulations, which can be an early clue to conditions like internal bleeding, liver disease, heart failure, or certain infections.

When fluid is found, ultrasound helps determine where it's concentrated and how much is present. We look for fluid around the liver, between loops of intestine, and in the deeper recesses of the abdomen. The distribution pattern can sometimes hint at the underlying cause, though fluid analysis is usually needed to confirm what's driving the accumulation.

If your veterinarian recommends sampling the fluid — either for diagnosis or to relieve discomfort — ultrasound provides real-time guidance for a safe, targeted needle placement. This significantly reduces the risk compared to sampling blindly. Abdominocentesis, the procedure of collecting abdominal fluid with a needle, is typically quick and well-tolerated. The sample is then evaluated to determine whether the fluid is consistent with infection, bleeding, organ dysfunction, or something else, which directly informs the treatment plan.

Ultrasound is not always the first test ordered — but it becomes an important tool when other diagnostics leave questions unanswered. Common situations where ultrasound is recommended include persistent vomiting or diarrhea that hasn't responded to initial treatment, unexplained weight loss, increased thirst or urination, chronic or recurrent urinary problems, and belly pain or distension that doesn't have an obvious cause on physical exam.

It's also frequently used to follow up on bloodwork abnormalities. If liver enzymes are elevated or kidney values are slightly off, ultrasound helps determine whether there's a structural change explaining the numbers — or whether the issue is likely elsewhere. In older pets, routine screening ultrasounds can be valuable for catching changes before they become clinical problems.

Your veterinarian will recommend ultrasound when they believe the additional information will meaningfully change the direction of your pet's care. It is one piece of the diagnostic puzzle — often used alongside bloodwork, X-rays, urinalysis, and physical findings — and it is most effective when interpreted in the context of your pet's overall clinical picture. We're always happy to explain why a particular test is being recommended and what we expect it to show.

Both X-rays and ultrasound are valuable diagnostic tools, but they show different things. X-rays are particularly good at evaluating bones, joints, and the chest — they quickly reveal fractures, lung changes, heart size, and many swallowed objects. They are fast, widely available, and often the best first step for acute injuries or respiratory symptoms.

Ultrasound, on the other hand, excels at showing soft tissues in detail. Where an X-ray might show that the liver is present, ultrasound reveals its internal texture, size, and blood flow. It can distinguish between a solid mass and a fluid-filled cyst, evaluate the layers of the intestinal wall, and detect small amounts of free fluid that X-rays routinely miss.

In many cases, the two imaging modalities complement each other rather than compete. An X-ray might be ordered first to rule out obvious skeletal or chest problems, and if the answer isn't clear, ultrasound follows to investigate the abdominal organs more thoroughly. Your veterinarian chooses the imaging approach — or combination of approaches — that makes the most sense for your pet's specific symptoms and clinical history. Both are non-invasive, and in most cases, ultrasound can be performed the same day if needed.