Dogs do not get hemorrhoids in any meaningful clinical sense. True hemorrhoids, the swollen veins inside or around the rectum that plague millions of humans, are extraordinarily rare in dogs and essentially absent from veterinary case literature. What dog owners typically notice and describe as “hemorrhoids” is almost always a different condition entirely, most commonly anal sac disease, but sometimes a perianal tumor, perineal hernia, rectal prolapse, or perianal fistula. The distinction matters enormously because the correct treatment for each of these conditions is completely different, and applying human hemorrhoid remedies to a dog can cause real harm.
Why Dogs Almost Never Develop True Hemorrhoids
Hemorrhoids in humans are partly a consequence of walking upright. Standing and sitting position puts sustained gravitational pressure on the veins around the anus and lower rectum, which over time can cause those veins to swell and protrude. Dogs, walking on four legs, distribute that pressure differently. The anatomical setup that makes hemorrhoids so common in people simply does not apply to quadrupeds. When a veterinarian examines a dog’s rear end and finds swelling, redness, or a protruding mass, the diagnosis is almost never a dilated hemorrhoidal vein. It is one of several other conditions that produce similar-looking symptoms.
This creates a real problem for dog owners who search online for help. Typing “dog hemorrhoids” into a search engine pulls up a mix of advice, much of it based on the incorrect assumption that the condition exists in dogs the same way it does in people. The treatments suggested for human hemorrhoids, including over-the-counter creams and suppositories, are not only useless for the conditions dogs actually have but can be toxic. Understanding what is really going on back there is the first step toward getting your dog proper care.
Anal Sac Disease, the Usual Culprit
The condition most often mistaken for hemorrhoids in dogs is anal sac disease. Dogs have two small glands, one on each side of the anus, that produce a pungent, oily secretion. These glands normally empty when a dog defecates. When they fail to empty properly, the secretion builds up and the sacs become impacted, inflamed, or infected. The swelling and discomfort this produces can look, to an owner, very much like what they would call hemorrhoids.
Anal sac disease is common and can be tricky to diagnose accurately, in part because the contents of healthy anal sacs vary quite a bit from dog to dog. The color and consistency of the secretion differ enough that even veterinary professionals can overdiagnose sacculitis, confusing normal variation with infection. Making things harder, other conditions including flea allergy, atopy, vaginitis, parasites, and perianal fistulas can produce the same scooting, licking, and swelling that anal sac problems cause. A proper diagnosis requires ruling those out first.1Wiley Online Library. Disease conditions of canine anal sacs
Behavioral Signs to Watch For
Dogs with anal sac problems tend to show a recognizable set of behaviors. Scooting, where the dog drags its rear across the floor, is the most well-known, but it is not the only sign. Excessive licking of the perianal area, biting at the base of the tail, and general restlessness or reluctance to sit are all common. In dogs with chronic anal sac disease, scooting behavior tends to recur with a median frequency of about three weeks after the sacs are manually expressed by a vet or groomer.2PubMed. Comparison of anal sac cytological findings and behaviour in clinically normal dogs and those affected with anal sac disease
The challenge is that perianal itching is not unique to anal sac disease. Research has found that dogs with canine atopic dermatitis and adverse food reactions show perianal itching at significantly higher rates than dogs with other skin conditions. In one study, roughly half of dogs with atopic dermatitis and about half with food reactions exhibited perianal itching, accompanied by visible signs like redness, hair loss, and thickened skin around the anus. That itching was not linked to anal sac impaction or to bacterial or yeast infections in those dogs, meaning the sacs were fine but the skin itself was the problem.3PubMed Central. Perianal pruritus in dogs with skin disease So if your dog is scooting and you assume it is the anal glands, you could be missing an underlying allergy or food sensitivity.
Which Dogs Are Most Prone to Anal Sac Problems
Size is the clearest risk factor. Anal sac disease is reported more often in small dogs under about 10 kilograms and medium-sized dogs between 10 and 30 kilograms than in large breeds. Gender, neuter status, coat type, and diet were not found to be meaningful predisposing factors in a cross-sectional study of the condition.4PubMed Central. A Cross-Sectional Study on Canine and Feline Anal Sac Disease
Breed matters too. A large UK study found that Cavalier King Charles Spaniels, King Charles Spaniels, Cockapoos, Shih Tzus, Bichon Frises, and Cocker Spaniels all had elevated odds of developing anal sac problems compared to mixed-breed dogs. On the other end, Labrador Retrievers, Border Collies, Staffordshire Bull Terriers, Lurchers, German Shepherd Dogs, and Boxers showed lower odds. The same study found that brachycephalic breeds (those with short, flat faces) had about 2.6 times the odds of anal sac disease compared to dolichocephalic breeds (those with long muzzles).5PubMed. Non-neoplastic anal sac disorders in UK dogs: Epidemiology and management aspects of a research-neglected syndrome If you own one of the higher-risk breeds and notice recurrent scooting or perianal discomfort, anal sac disease should be near the top of your list of suspects.
When the Problem Is a Lump or Mass
Some owners discover what they believe is a hemorrhoid when they feel or see an actual mass near their dog’s anus. This is a different situation from anal sac impaction, and it needs prompt veterinary attention. The perianal region is a relatively common location for tumors in dogs, and the two most frequently encountered are perianal gland adenomas (benign, hormone-driven tumors most common in intact male dogs) and anal sac adenocarcinomas (malignant tumors that can arise in any dog).6PubMed Central. Deep dermal and subcutaneous canine hemangiosarcoma in the perianal area: diagnosis of perianal mass in a dog
Perianal gland adenomas are the more reassuring diagnosis. These benign tumors are driven by hormone receptors, and in intact male dogs they often respond to neutering or antihormonal therapy. Research has shown that adenomas with high expression of androgen and estrogen receptors can regress completely with antihormonal treatment. Malignant variants like hepatoid epitheliomas and carcinomas, which express those receptors at lower levels, may shrink with therapy but typically do not resolve entirely, requiring surgical removal.7PubMed Central. Pharmacological Treatment of Perianal Gland Tumors in Male Dogs
Anal sac adenocarcinomas are far more concerning. These malignant tumors often present with signs that mimic other conditions: straining to defecate, constipation, increased thirst and urination, or appetite loss. In a study of 43 dogs with this cancer, over half had elevated blood calcium levels at the time of diagnosis, and nearly four in five already had metastases, most commonly to the regional lymph nodes.8Journal of Veterinary Internal Medicine. Canine Anal Sac Adenocarcinomas: Clinical Presentation and Response to Therapy A lump near the anus that is firm, growing, or accompanied by changes in your dog’s bathroom habits or overall energy warrants a vet visit sooner rather than later. Cytology or biopsy is needed to tell benign from malignant masses, and other unexpected tumor types can also arise in this area.
Perineal Hernias
Another condition that can produce visible swelling near a dog’s anus is a perineal hernia, where the muscular floor of the pelvis weakens and allows abdominal contents, often a loop of rectum or fat, to bulge into the perineal area. The swelling can appear as a soft or firm mass on one or both sides of the anus, and to an untrained eye it can look like a severe hemorrhoid.
Affected dogs typically show difficulty defecating, straining, and pain or swelling in the perineal region. One case documented a dog presenting with a feces-filled sac in the perineal area visible on radiographs, along with an enlarged rectum.9PubMed. Combined use of polypropylene mesh and collagen sponge in the surgical repair of perineal hernia with rectal diverticulum in a dog Another case involved an 8-year-old male German Shepherd with a month-long history of straining, swelling, and a firm irreducible mass in the left perineal area, where digital rectal examination revealed the rectum had been displaced and the muscular pelvic floor was absent on that side.10Veterinary Record Case Reports. Spermatic cord torsion associated with perineal hernia in a cryptorchid dog
Perineal hernias are most common in intact older male dogs, likely because testosterone contributes to weakening of the pelvic floor muscles over time. Surgical repair is the standard treatment, and neutering at the time of surgery helps reduce the chance of recurrence. The condition is distinctly different from hemorrhoids in cause, anatomy, and treatment, but the outward appearance of a perineal bulge can easily fool an owner into thinking they are seeing a hemorrhoidal protrusion.
Perianal Fistulas and Their Link to Immune Disease
Perianal fistulas are deep, ulcerating tracts that form in the skin around the anus. They tend to look raw, painful, and sometimes bloody. German Shepherd Dogs are far more affected than any other breed, which has led researchers to investigate an autoimmune connection. A study of 27 German Shepherds with perianal fistulas found that the dogs also had histological evidence of colitis, suggesting an immune-mediated process affecting both the colon and the perianal skin.11PubMed. Association of perianal fistula and colitis in the German shepherd dog: response to high-dose prednisone and dietary therapy
Perianal fistulas are considered one of the more serious perianal conditions because they cause significant pain and are prone to recurrence. Modern treatment usually involves immunosuppressive medications rather than surgery alone, reflecting the autoimmune component. Dogs with this condition may resist sitting, cry out during bowel movements, or become aggressive when their rear end is touched. If the skin around your dog’s anus looks raw, cratered, or is oozing rather than simply swollen, fistulas should be on the differential.
Managing Anal Sac Problems Before They Become Chronic
For dogs with recurrent anal sac impaction, the standard short-term fix is manual expression of the glands, either externally or internally by a veterinarian. This provides relief, but as noted earlier, symptoms tend to recur within a few weeks in chronically affected dogs. Dietary fiber has long been recommended as a preventive measure, with the logic that bulkier stools put more pressure on the anal sacs during defecation and help them empty naturally. A recent clinical trial tested an oral chew containing fiber and a probiotic strain in dogs with recurrent impaction, and dogs receiving the chew showed a reduction in clinical signs over a 120-day evaluation period, with fewer instances of needing manual sac expression.12PubMed. Efficacy of an oral chew containing fibre and Bacillus velezensis C-3102 in the management of anal sac impaction in dogs
When conservative management fails and a dog needs repeated veterinary visits for expression or develops infections, anal sacculectomy, the surgical removal of the glands, becomes an option. A study of this procedure in small-breed dogs and cats found that out of 28 animals, only one experienced short-term complications: mild fecal incontinence on the first day after surgery and scooting for up to a week. Both resolved without additional treatment, and none of the animals developed visible inflammation, excess drainage, or seroma formation.13PubMed Central. Inside-out anal sacculectomy in small dog breeds and cats For dogs whose quality of life is genuinely affected by chronic anal sac disease, the surgery appears to carry low risk and offers a permanent solution.
Why You Should Never Use Human Hemorrhoid Products on a Dog
This is the most important practical takeaway for the owner who arrived here searching for relief for their dog. Human hemorrhoid creams and suppositories typically contain active ingredients like hydrocortisone, phenylephrine, pramoxine, or lidocaine, sometimes combined with zinc oxide or petroleum-based carriers. Dogs lick. Anything applied to the perianal area will almost certainly be ingested, and several of these compounds can be harmful when swallowed by a dog. Phenylephrine, a vasoconstrictor common in products like Preparation H, can raise a dog’s heart rate and blood pressure. Lidocaine ingestion can cause neurological symptoms. Even topical steroids, while sometimes prescribed by vets in specific formulations, can cause problems when absorbed systemically through licking.
Beyond toxicity, the fundamental issue is that you would be treating the wrong condition. A hemorrhoid cream is designed to shrink swollen veins. If your dog’s problem is an impacted anal gland, the cream does nothing to address the blockage. If it is a tumor, you are losing time that could matter for treatment outcomes. If it is a perianal fistula, you may be masking pain while the ulceration worsens beneath the surface. The safest course when your dog shows perianal swelling or discomfort is a vet visit, not a trip to the pharmacy.
Rectal Prolapse, the Condition That Looks Most Like a Hemorrhoid
If there is one canine condition that could be fairly described as visually resembling a human hemorrhoid, it is rectal prolapse, where a portion of the rectal lining protrudes through the anus. This typically appears as a red, tubular mass of moist tissue sticking out from the anus. It can occur in dogs of any age but is more common in young dogs with severe diarrhea or in older dogs straining from constipation, intestinal parasites, or urogenital disease.
Rectal prolapse is a veterinary emergency. The exposed tissue dries out and swells quickly, making it progressively harder to reduce. Mild cases where the tissue has just appeared can sometimes be gently pushed back in by a veterinarian and held in place with a temporary purse-string suture while the underlying cause is treated. More severe or recurring cases may require surgical amputation of the prolapsed tissue. Unlike hemorrhoids, which in humans can often be managed with lifestyle changes and over-the-counter treatments, rectal prolapse in dogs demands professional intervention quickly. Waiting and hoping it resolves is how tissue damage and infection set in.
Getting the Right Diagnosis
Because so many different conditions cluster in the same small anatomical region and produce overlapping symptoms, getting the right diagnosis often requires more than a visual inspection. A veterinarian will typically perform a digital rectal exam to assess the anal sacs, check for masses, and evaluate the integrity of the pelvic floor. Depending on what they find, additional steps might include cytology of anal sac contents, fine-needle aspiration of any masses, blood work to check calcium levels if a tumor is suspected, and imaging such as radiographs or ultrasound to look for internal masses or herniation.
The two most common perianal tumors require cytology or histopathology for accurate differentiation, and other unusual tumor types can appear in the area as well.14PubMed Central. Deep dermal and subcutaneous canine hemangiosarcoma in the perianal area: diagnosis of perianal mass in a dog For conditions like perianal fistulas, where the visible lesions are distinctive but the underlying immune involvement determines treatment, a biopsy and sometimes colonoscopy may be warranted. The point is that “it looks like a hemorrhoid” is not a diagnosis. The range of conditions that can produce swelling, redness, or a mass near a dog’s anus is wide enough that even experienced veterinarians need diagnostics to sort them out. An owner working from a Google search has essentially no chance of guessing correctly, and guessing incorrectly means delayed treatment for conditions where timing can matter.