If your dog still smells like poop after a bath, the odor is almost certainly coming from somewhere the shampoo didn’t reach. The most common culprit is the anal glands, two small sacs just inside your dog’s rectum that produce a potent, foul-smelling liquid. But trapped fecal matter in the fur, dental disease, and even incomplete drying can all contribute to a smell that no amount of scrubbing seems to fix.
Anal Glands Are the Most Likely Cause
Every dog has two anal sacs, one on each side of the anus, that produce a thick secretion packed with volatile fatty acids, sulfur compounds, and other chemicals. Under normal conditions, this liquid squeezes out during bowel movements and serves as a kind of scent signature for other dogs. But when the glands don’t empty properly, the secretion builds up, leaks at random times, and creates a persistent smell that owners often describe as fishy or fecal. Because this odor comes from inside the body, bathing the outside of your dog does nothing to address it.
You might notice the smell gets worse when your dog is nervous or excited, since stress can trigger a spontaneous release of anal sac fluid. Some dogs leave traces of the discharge on furniture, bedding, or the floor. If your dog is scooting their rear across the ground or licking the area excessively, that’s a strong signal the glands are full, impacted, or irritated.
Anal sac disease affects roughly 16% of dogs overall, and small breeds are hit hardest. In one cross-sectional study, 60% of affected dogs weighed less than 10 kilograms (about 22 pounds). Chihuahuas, French Bulldogs, Jack Russell Terriers, Lhasa Apsos, and Beagles topped the list, though Labrador Retrievers and German Shepherds also appeared frequently. If your dog fits one of these profiles and smells bad despite regular baths, anal glands should be your first suspicion.
A veterinarian or groomer can manually express the glands, which often provides immediate relief from the odor. Dogs with recurring problems may need this done every few weeks. In severe cases where the glands become infected or abscessed, veterinary treatment is necessary.
Fecal Matter Trapped in the Fur
Long-haired and double-coated breeds are especially prone to collecting fecal residue in the fur around their rear end. If your dog has soft stools or occasional diarrhea, the problem gets worse quickly. A standard bath may not fully clean this area, particularly if the hair is matted or dense enough to trap waste close to the skin.
The fix is a sanitary trim, where the fur around the anus (and for females, around the vulva) is clipped short to prevent waste from clinging. Groomers typically use a #10 blade setting, which is short enough to keep the area clean but long enough to avoid irritating the delicate skin. They clip away from the anal opening rather than directly over it. Some owners request a minimal trim while others prefer a more generous clip. Either way, keeping this area short dramatically reduces the chance of odor between baths. If your dog is prone to this issue, ask your groomer to include a sanitary trim at every appointment.
Dental Disease Can Smell Like Feces
Sometimes the smell isn’t coming from your dog’s rear at all. Advanced dental disease produces sulfur compounds from destructive bacteria breaking down tissue in the mouth. The result is a rotting, fecal-like odor on your dog’s breath that can seem to come from their whole body, especially if they lick themselves frequently or drool onto their coat. That drool-soaked fur then becomes its own source of bacterial growth and smell.
As plaque hardens into tartar and gingivitis progresses into periodontitis, the bacterial population in the mouth shifts from harmless species to destructive ones that produce these volatile sulfur compounds. If you notice the smell is strongest near your dog’s face, or if their breath alone is enough to clear a room, dental disease is worth investigating. Dogs with red, swollen gums, loose teeth, or excessive drooling are overdue for a dental evaluation.
You Might Not Be Drying Thoroughly Enough
A damp dog is a smelly dog. The microorganisms that naturally live on your dog’s skin and in their coat, including bacteria and yeast, release waste compounds that become airborne when water disrupts them. If your dog stays damp for hours after a bath, those organisms undergo a rapid population boom in the moist environment, producing even more odor than before the bath. This is the same mechanism behind “wet dog smell,” but in a dog that’s already prone to odor, it can easily be mistaken for a fecal smell that survived the bath.
Drying your dog as quickly as possible after bathing makes a measurable difference. Use absorbent towels to remove as much water as you can, then follow up with a blow dryer on a low-heat setting if your dog tolerates it. Pay special attention to areas where moisture hides: the armpits, groin, between the toes, under the ears, and within a thick undercoat. Dogs with dense double coats can feel dry on the surface while remaining damp against the skin for hours.
Skin Conditions and Chronic Moisture
Dogs with allergies, whether environmental or food-related, often develop a musty or sour odor from chronic skin inflammation. Allergic dermatitis disrupts the skin’s normal barrier, allowing yeast and bacteria to overpopulate. This produces a smell that bathing temporarily masks but doesn’t eliminate, because the underlying inflammation returns within days. If your dog’s coat is chronically damp from excessive licking, drooling, or skin weeping, those wet areas become breeding grounds for odor-causing organisms.
Skin folds in breeds like Bulldogs, Shar-Peis, and Pugs trap moisture and debris in places a bath can’t easily reach. These folds need to be cleaned individually, dried completely, and checked regularly for redness or discharge.
Kidney Disease and Other Systemic Causes
In rarer cases, persistent odor that doesn’t respond to bathing can signal an internal health problem. Kidney disease causes waste products that are normally filtered out of the blood to accumulate, producing an ammonia-like smell on the breath that some owners interpret as fecal. This is more common in older dogs and is usually accompanied by other signs like increased thirst, decreased appetite, weight loss, or changes in urination.
If your dog’s smell is new, has gotten progressively worse, or comes with any changes in behavior, appetite, or energy level, the odor may be a symptom rather than a grooming problem. A persistent fecal smell paired with scooting, visible discharge, swelling near the anus, or signs of pain warrants a veterinary visit to rule out impacted or infected anal glands, skin infections, or systemic illness.