A hernia on a dog typically looks like a soft, squishy bulge just beneath the skin. The size, exact location, and firmness of that bulge depend on the type of hernia, but the most common version, an umbilical hernia, appears as a round swelling on your dog’s belly, right below the rib cage. Some hernias are barely noticeable, while others are large enough to spot from across the room.
Umbilical Hernias: The Most Common Type
Umbilical hernias show up at or near the belly button, on your dog’s underside just below the rib cage. They’re especially common in puppies. The hernia appears as a soft swelling beneath the skin, ranging from less than a quarter inch to over an inch in diameter. Small ones feel like a squishy marble under the skin. Larger ones can look like a pronounced bubble or pouch protruding from the belly.
Many puppy umbilical hernias close on their own by the time the dog is three to four months old. The breeds most prone to them include Weimaraners, Pekingese, Basenjis, and Airedale Terriers, suggesting a genetic component.
Inguinal Hernias: Swelling in the Groin
Inguinal hernias appear as a bulge in the groin area, where the inner thigh meets the belly. Internal organs like the intestines or bladder push through a weak spot in the abdominal wall, creating a visible swelling on one or both sides of the groin. In uncomplicated cases, the lump is soft and painless. You can often see or feel it when your dog is standing or lying on their back.
Young male dogs are more likely to be born with inguinal hernias, while older, unspayed females are more prone to developing them later in life. Estrogen can weaken the tissue in the groin wall, making intact females particularly vulnerable. If the hernia becomes complicated (meaning tissue gets trapped), the swelling may feel warm to the touch and become painful.
Perineal Hernias: Near the Tail
Perineal hernias look like a bulge beside the anus, on one or both sides. The swelling appears when fat or abdominal organs push through weakened muscles in the pelvic floor. This type is most common in older, unneutered male dogs. The bulge may become more obvious when your dog strains to defecate, and it can shift in size throughout the day. Dogs with perineal hernias often have difficulty pooping, which is sometimes the first clue something is wrong.
Hernias You Can’t See
Not all hernias produce a visible lump. Diaphragmatic hernias occur when organs from the abdomen push through a tear in the diaphragm (the muscle separating the chest from the belly) and into the chest cavity. There’s no external bulge to find. These hernias are usually caused by trauma, like being hit by a car, and are diagnosed through X-rays or ultrasound. Signs include difficulty breathing, a tucked-up abdomen, and a general sense that your dog is in distress.
Hiatal hernias, where part of the stomach slides up through the diaphragm, are also invisible from the outside. They tend to cause vomiting, regurgitation, drooling, and sometimes bloody vomit. Brachycephalic breeds (flat-faced dogs like Bulldogs and Pugs) are overrepresented, and Shar-Peis may have a hereditary predisposition.
How a Hernia Feels When You Touch It
The way a hernia feels under your fingers tells you a lot about how serious it is. Veterinarians classify hernias as either reducible or non-reducible. A reducible hernia feels soft and squishy, and the contents can be gently pushed back into the abdomen. You might notice the lump disappears when your dog lies on their back, then reappears when they stand up or strain.
A non-reducible hernia feels firmer and won’t flatten when pressed. This means the tissue inside is trapped. Non-reducible hernias fall into two categories: incarcerated, where the contents are stuck but still receiving blood flow, and strangulated, where blood supply to the trapped tissue has been cut off. An incarcerated hernia can progress to strangulation over time as the opening tightens around the tissue, causing swelling and restricted blood flow.
Signs a Hernia Is an Emergency
Most small hernias sit quietly under the skin without causing problems. The danger comes when an organ gets trapped and its blood supply is cut off. A strangulated hernia requires emergency surgery. Watch for these changes:
- Pain at the site: your dog flinches, whimpers, or snaps when you touch the area
- Warmth or firmness: the lump feels hot, hard, or swollen compared to before
- Color changes: the skin over the hernia appears red or darkened
- Systemic signs: vomiting, loss of appetite, lethargy, or nausea
A hernia that was previously soft and reducible but suddenly becomes firm and painful has likely become incarcerated or strangulated. This is not a wait-and-see situation.
How Hernias Are Diagnosed
External hernias (umbilical, inguinal, perineal) are usually diagnosed through a physical exam. Your vet will feel the lump, check whether it’s reducible, and assess its size. In some cases, ultrasound helps confirm what’s inside the hernia sac, whether it’s just fat or an actual organ.
Internal hernias require imaging. X-rays are the most common first step and can reveal organs in the wrong position, a disrupted diaphragm line, or abnormal fluid. If standard X-rays aren’t conclusive, contrast dyes can be used to highlight the digestive tract. Ultrasound, CT, and MRI are additional options when available, and in some cases surgical exploration is the only way to get a definitive answer.
What Repair Costs
Hernia repair costs vary dramatically depending on type and complexity. Simple umbilical hernias are the least expensive to fix, typically running $150 to $400, and they’re often repaired at the same time as a spay or neuter. Inguinal hernia repair averages around $2,300. Perineal hernias cost between $1,500 and $5,000 due to the complexity of the pelvic floor reconstruction. Diaphragmatic hernias, which require opening the chest cavity, range from $4,000 to $8,000 or more. The overall average across all types is roughly $1,600, but that number is heavily skewed by the large number of simple umbilical repairs.
Small umbilical hernias in puppies, particularly those under a quarter inch, are often monitored rather than immediately repaired. If the opening hasn’t closed by the time the dog is spayed or neutered, the vet can fix it during that same procedure. Larger hernias, or any hernia that contains organs rather than just fat, typically need prompt surgical repair regardless of type.