# Hernia and Incontinence After Spay: What Owners Should Know A hernia in dogs after spay and urinary incontinence are two different complications that can show up weeks to years after the surgery. Most hernias at the incision line are small and harmless, while incontinence is a hormone-related issue that responds well to medication. Neither one means the spay was done wrong, and both have clear treatment paths. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - A bulge at the spay incision is usually a small incisional hernia or a seroma, and your veterinarian can tell the difference with a hands-on exam. - Urinary incontinence after spay most often appears as leaking while your dog sleeps, and it typically starts months to years after surgery, not the same week. - True groin (inguinal) and perineal hernias are separate conditions with their own causes, and perineal hernias occur almost entirely in male dogs [1]. - Most post-spay incontinence is managed successfully with daily medication, and many dogs stay dry on it for life. - Any bulge that is painful, warm, growing fast, or paired with vomiting needs same-day veterinary care. ## What Is a Hernia in Dogs After Spay? A hernia is a hole or weak spot in the body wall that lets fat, intestine, or another organ push through. After a spay, the most common spot is the linea alba, the fibrous strip of tissue your veterinarian closed along the middle of the belly. If that closure separates partially, a small bulge can form under the skin. This is different from a seroma, which is a pocket of fluid that collects in the surgical site during the first week or two. A seroma feels soft and squishy. A hernia often feels like a soft ring you can push a finger into, and it may get bigger when your dog strains or coughs. Two other hernia types get confused with post-spay problems. An inguinal hernia sits in the groin crease where the belly meets the inner thigh. A perineal hernia sits next to the rectum and results from failure of the pelvic diaphragm, the muscular sling that holds the pelvic organs in place [2]. Perineal hernias are strongly associated with male dogs, and one large review of 87 dogs with perineal hernia included 86 males and only 1 female [1]. So if your spayed female has a bulge near her rear end, a perineal hernia is possible but unlikely. ## Signs Owners Notice ### At the incision or belly - A soft lump under or near the spay scar - A bulge that changes size through the day - A spot that feels like a small opening under the skin - Redness, warmth, or discharge, which points more toward infection than hernia ### In the groin - A swelling in the crease of the inner thigh - A bulge that appears when your dog stands and softens when she lies down - Discomfort when you touch the area ### Urinary signs - Wet spots where your dog was sleeping - Damp fur on the belly or inner thighs - Leaking when your dog is relaxed, not when she is excited - Normal urination outside plus leaking in between The leaking pattern matters. Dogs with post-spay incontinence usually have normal bladder control when awake and leak when asleep or resting. Dogs with a urinary tract infection often strain, urinate small amounts frequently, or have cloudy or bloody urine. Your veterinarian will sort out which one you are dealing with. If your dog was previously house trained and has started having accidents, our guide to [dog potty training regression after spay](/knowledge/veterinary-medicine/behavior/dog-potty-training-regression-after-spay) covers the behavior side of that problem. ## Causes and Risk Factors ### Why incisional hernias happen The abdominal wall is closed in layers during a spay, and that closure can fail for several reasons. A dog who is very active in the first days after surgery, or who coughs or strains repeatedly, puts extra pressure on the repair. Some dogs have naturally thinner or weaker tissue at the midline. Surgical technique plays a role too, but even a technically perfect closure can separate. ### Why incontinence happens Spaying removes the ovaries, which are the main source of estrogen in a female dog. Estrogen helps keep the urethral sphincter, the muscle that holds urine in, toned and responsive. When estrogen drops after spay, some dogs develop a weak sphincter and leak. This is called urethral sphincter mechanism incompetence, and it is the most common cause of post-spay leaking. Body size matters. Incontinence after spay is reported more often in larger breeds and in dogs who are overweight. The timing varies widely. Some dogs leak within a few months of surgery, and others start years later. ### Risk factors for hernias in general - Being male, for perineal hernia [1] - Older age, since tissue strength declines over time - Chronic straining from constipation or prostate disease - Prior hernia repair, since scar tissue and adhesions make repeat surgery harder [3] One study of dogs with perineal hernia found real changes in the blood vessels and nerves of the pelvic region, including altered perineal arteries and displacement or deterioration of the superficial perineal nerve [2]. That helps explain why these hernias can affect urination and defecation, not just create a visible bulge. ## How It Is Diagnosed Your veterinarian starts with their hands. They will feel the bulge, check whether it can be reduced (pushed back in), and note whether it is painful. They will also watch your dog walk and check the groin and rear end. For suspected hernias, imaging confirms the diagnosis. Ultrasound is the usual first step because it shows whether intestine or fat is inside the defect and whether the tissue looks healthy. X-rays can help if your veterinarian suspects an organ has slipped into the hernia sac. For incontinence, the workup is different. Your veterinarian will run a urinalysis and often a urine culture to rule out infection, since infection causes similar leaking. They may check blood work to look at kidney values and rule out other causes. If those are normal and the leaking pattern fits, a diagnosis of urethral sphincter mechanism incompetence is reasonable. In complicated cases, contrast imaging can map the urinary tract. In one reported case of recurrent perineal hernia with bladder displacement, retrograde urethrocystography performed 8 days after salvage surgery helped confirm the urinary tract was back in position [3]. That level of imaging is reserved for complex or repeat cases. ## Treatment Options Treatment depends on which problem your dog has and how much it bothers her. | Problem | Typical first step | If that does not work | |---|---|---| | Small incisional hernia | Monitor and recheck | Surgical repair | | Large or painful incisional hernia | Surgical repair | Referral to a surgeon | | Inguinal hernia | Surgical repair | Referral to a surgeon | | Perineal hernia | Surgical repair | Salvage techniques such as muscle flaps or slings | | Post-spay incontinence | Daily medication | Dose adjustment or added medication | ### Hernia repair Small incisional hernias that are not changing and not bothering your dog are often watched. Larger ones, or any hernia that contains intestine, should be repaired. The surgery closes the defect and rebuilds the wall. Perineal hernia repair has several established techniques. A review of 87 dogs compared the traditional technique, an internal obturator muscle flap, and a sacroischial sling [1]. The sling technique had a success rate of 98.1 percent, significantly higher than the traditional technique, and the traditional group had the highest rate of temporary difficulty urinating at 20.8 percent [1]. The muscle flap took longer to perform than the other two methods [1]. Your surgeon will pick the approach that fits your dog's anatomy and the size of the defect. Repeat hernias are harder. Adhesions can prevent the surgeon from moving organs back where they belong, which is why salvage procedures sometimes combine several steps, including releasing scar tissue, returning the bladder to the abdomen, and reconstructing the pelvic diaphragm [3]. ### Incontinence treatment Most post-spay incontinence is managed with medication, not surgery. Your veterinarian will choose the drug and calculate the dose based on your dog's weight, kidney function, and other health conditions. Do not adjust the dose on your own. Some dogs need a combination of medications, and some need a change in diet or weight loss to take pressure off the bladder. If medication alone does not control the leaking, your veterinarian may discuss other options, including injectable bulking agents or surgery, though these are less commonly used. For dogs who also have arthritis, mobility problems, or other age-related issues, our article on [caring for a senior dog with incontinence](/knowledge/veterinary-medicine/senior-and-chronic-care/senior-dog-incontinence-care) covers practical products and daily routines. ## Recovery, Outlook, and Long-Term Management ### After hernia surgery Expect a restricted activity period while the repair heals. Your veterinarian will tell you exactly how long, and it usually means leash walks only, no jumping, and no rough play. Watch the incision daily for swelling, discharge, or a new bulge. Pain control matters. A study of dogs undergoing spay surgery tracked pain scores alongside inflammatory markers including TNF-α, IL-6, haptoglobin, C-reactive protein, and cortisol over the first week [4]. Postoperative pain is real and measurable, so give all pain medication exactly as prescribed and call if your dog seems uncomfortable. Our guide to [caring for a dog after surgery](/knowledge/veterinary-medicine/life-stage-emergency-care/caring-for-a-dog-after-surgery-pain-management-rest-and-wound-monitoring) walks through wound checks and rest schedules. ### After an incontinence diagnosis Most dogs respond well to medication and stay dry long term. Some need periodic dose adjustments as they age or gain weight. Recheck urine tests help catch infections early, since dogs on incontinence medication can still get urinary tract infections. If your dog is leaking after a recent spay, our article on [spay incontinence in female dogs](/knowledge/veterinary-medicine/preventive-care/spay-incontinence-in-female-dogs-estrogen-deficiency-and-propalin-dosing) explains the hormone connection and how medication is typically dosed. ### What to expect long term Small hernias that are monitored often stay small for years. Repaired hernias generally hold, though the risk of recurrence is higher after a second repair [3]. Incontinence managed with medication usually stays controlled, and most owners report a big improvement in quality of life once the leaking stops. ## Prevention You cannot prevent every post-spay complication, but you can lower the odds. - Follow activity restrictions after spay surgery exactly. Most incisional hernias are linked to too much movement too soon. - Keep your dog at a healthy weight. Extra body fat raises pressure inside the abdomen and is a known factor in incontinence. - Treat constipation early. Chronic straining weakens the pelvic floor and can contribute to hernia formation. - Spay timing is a personal decision. A 2025 systematic review examined whether spaying before puberty reduces mammary tumor risk and found the evidence is not as clear as once believed [5]. Discuss timing with your veterinarian based on your dog's breed, size, and health. - If your dog is older, ask about the surgical approach. A study of 486 bitches evaluated ovariectomy in older dogs and tracked complications and long-term uterine health, which can help your veterinarian pick the safest option for an older pet [6]. - Attend recheck appointments. Small problems found early are easier to manage than ones found months later. ## Limitations and When to Contact a Veterinarian Call your veterinarian the same day if you notice: - A bulge at the incision that is new, growing, or firm - Vomiting, drooling, or refusing food along with a bulge - A bulge that is red, warm, or painful to touch - Straining to urinate or producing no urine - Leaking that started suddenly or got much worse Go to an emergency clinic now if your dog has a painful, hard swelling that cannot be pushed back, is retching without producing anything, or has a swollen, tense abdomen. These can be signs of a strangulated hernia, which is a surgical emergency. Schedule a routine visit if your dog has started leaking while sleeping, has a soft bulge that is not changing, or has had accidents after being reliably house trained. Every dog is different, and only your veterinarian can examine your pet, review her history, and decide what is right for her. ## Frequently Asked Questions ### Is a hernia after spaying common? Small incisional hernias are an uncommon but recognized complication, and most are minor. True perineal hernias are far more common in male dogs than females [1]. If you feel a bulge at your dog's spay scar, have it checked instead of waiting. ### Can a hernia after spay go away on its own? A seroma, which is fluid, often resolves on its own within a few weeks. A true hernia, which is a defect in the muscle wall, does not close by itself. Small ones may never cause a problem, but they should be monitored by your veterinarian. ### Why is my dog leaking urine years after being spayed? The hormone change from spaying affects the urethral sphincter, and the effect can take months or years to show up as leaking. This is called urethral sphincter mechanism incompetence. It is treatable with daily medication in most dogs. ### Does a hernia after spay always need surgery? No. Small hernias that are stable and not causing symptoms are often watched. Surgery is recommended when the hernia is large, painful, growing, or contains intestine. Your veterinarian will base the decision on the exam and any imaging. ### Can spaying cause incontinence in every dog? No. Most spayed female dogs never develop incontinence. It is more likely in larger breeds and in dogs who are overweight. If your dog does develop it, medication usually controls the leaking well. ## Related Articles - [Spay Incontinence in Female Dogs: Estrogen Deficiency and Propalin Dosing](/knowledge/veterinary-medicine/preventive-care/spay-incontinence-in-female-dogs-estrogen-deficiency-and-propalin-dosing) - [Dog Potty Training Regression After Spay](/knowledge/veterinary-medicine/behavior/dog-potty-training-regression-after-spay) - [How to Care for a Senior Dog with Incontinence: Tips and Products](/knowledge/veterinary-medicine/senior-and-chronic-care/senior-dog-incontinence-care) - [Caring for a Dog After Surgery: Pain Management Rest and Wound Monitoring](/knowledge/veterinary-medicine/life-stage-emergency-care/caring-for-a-dog-after-surgery-pain-management-rest-and-wound-monitoring) - [Dog Sp Spay Recovery Timeline Reddit](/knowledge/veterinary-medicine/preventive-care/dog-spay-recovery-timeline-reddit) - [Post-Spay and Post-Neuter Care for Dogs and Cats](/knowledge/veterinary-medicine/preventive-care/post-spay-neuter-care-dogs-cats) - [Incontinence in Dogs: Causes, Symptoms, and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/incontinence-in-dogs-causes-symptoms) - [Frequent Urination in Dogs After Spaying or Neutering](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-frequent-urination-after-spay-neuter) - [Dog Spay Incision Care: Normal Healing vs Problems](/knowledge/veterinary-medicine/preventive-and-routine-care/dog-spay-incision-care) ## References 1. [Retrospective evaluation of surgical outcomes using traditional, internal obturator muscle flap, and sacroischial sling technique for canine perineal hernia repair](https://pubmed.ncbi.nlm.nih.gov/41923834/). Journal of advanced veterinary and animal research, 2025. 2. [Preliminary Anatomical and Imaging Characterization of Vascular and Neural Changes in Dogs with Perineal Hernia](https://pubmed.ncbi.nlm.nih.gov/42076724/). Veterinary sciences, 2026. 3. [Salvage Surgery Including Rectal Wall Vas Deferens Pexy for Recurrent Bilateral Perineal Hernia with Bladder Retroflexion in a Dog: A Case Report](https://pubmed.ncbi.nlm.nih.gov/42798003/). Veterinary sciences, 2026. 4. [Association Between Postoperative Pain and Inflammatory Biomarkers After Ovariohysterectomy in Dogs: A Pilot Study](https://pubmed.ncbi.nlm.nih.gov/42573230/). Veterinary medicine and science, 2026. 5. [Systematic Review: Does Pre-Pubertal Spaying Reduce the Risk of Canine Mammary Tumours?](https://pubmed.ncbi.nlm.nih.gov/39943206/). Animals : an open access journal from MDPI, 2025. 6. [Ovariectomy in older bitches: a case study evaluating complications and long-term uterine health](https://pubmed.ncbi.nlm.nih.gov/42480582/). Tierarztliche Praxis. Ausgabe K, Kleintiere/Heimtiere, 2026. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)