A lamb that smells like poop usually has one of two problems: diarrhea matting into the wool from an infection or dietary issue, or (if you’re talking about lamb meat) early-stage spoilage. Both situations are common, and the specific smell can tell you a lot about what’s going on.
If You’re Raising Lambs: Scours Are the Most Likely Cause
The most common reason a live lamb smells strongly of feces is scours, the livestock term for diarrhea. Loose, frequent stool soaks into the wool around the tail and hind legs, creating a persistent fecal odor that clings to the animal. The smell can be surprisingly intense, especially in young lambs housed in close quarters.
During the first month of life, the four major causes of scours in lambs are E. coli (the most common), rotavirus, Cryptosporidium, and Salmonella. Clostridium bacteria, particularly type D, can also cause diarrhea in lambs of various ages. You can’t reliably identify which organism is responsible just by looking at or smelling the stool. A fecal sample sent for lab analysis is the only way to get a definitive answer.
Coccidiosis: A Particularly Foul Smell
If your lamb’s diarrhea smells especially rotten and contains mucus or blood, coccidiosis is a strong possibility. This parasitic infection hits lambs suddenly, producing severe diarrhea with a distinctly foul odor that’s noticeably worse than typical scours. The blood in the stool may look like dark, tarry staining or appear as visible streaks. In severe cases, the stool can consist almost entirely of large blood clots. Coccidiosis can be fatal, so a lamb showing these signs needs veterinary attention quickly.
Grain Overload and Dietary Changes
A sudden switch to grain or pellet feed can cause a condition called acidosis. Grain ferments rapidly in the rumen, producing large quantities of lactic acid that drop the rumen’s pH. The result is profuse scouring of pale, smelly feces. Even mild acidosis causes diarrhea, and the smell is distinctly sour and fecal. This is most common when lambs gain access to grain they aren’t accustomed to, or when the transition from forage to concentrate feed happens too quickly.
Lush spring pasture can trigger a similar reaction, producing loose, smelly stool that mats into the fleece. If the timing lines up with a feed change, that’s likely your culprit.
Flystrike Makes Everything Worse
When fecal staining or diarrhea keeps the wool moist, it creates the perfect conditions for flystrike. Blowflies lay eggs in the damp, soiled fleece, and the hatching maggots begin feeding on the skin. This produces a rotten, putrid odor that’s much worse than manure alone. Risk factors include constantly moist skin, skin infections, urine or fecal staining, and fleece rot from rainy weather. If you notice an intensifying smell that goes beyond normal manure, check the wool closely for maggots, particularly around the tail and hindquarters.
Natural Gland Secretions
Sheep have several scent-producing glands that can contribute to strong body odor, though these don’t typically smell like feces. The inguinal glands near the udder produce a yellowish, strong-smelling waxy substance rich in compounds called triterpenoids. This secretion plays a role in helping lambs find the udder. Sheep also have scent glands between their toes (interdigital glands) and near their eyes (infraorbital glands). These secretions are musky or oily rather than fecal, but combined with damp wool and manure contact, they can contribute to an overall unpleasant smell.
What To Do for a Smelly Lamb
Fluid replacement is the foundation of treating scours, regardless of the cause. A dehydrated lamb needs oral electrolytes to recover. For grain overload, drenching with mineral oil or antacids helps neutralize the excess acid in the rumen. Antibiotics are sometimes used for E. coli scours, but they won’t help with viral or parasitic causes, which is why identifying the organism matters.
In the short term, keeping the lamb’s hindquarters clean and dry reduces odor and lowers the risk of flystrike. Crutching (trimming wool around the tail area) helps air circulate and prevents fecal buildup.
If You’re Talking About Lamb Meat
Raw lamb that smells like feces or manure is almost certainly spoiled. Bacteria including Pseudomonas and Acinetobacter are the most common culprits behind off-odors in red meat, producing sour or putrid smells as they break down the tissue. Clostridium bacteria can also cause offensive odors in both raw and cooked meat products.
Fresh lamb should smell mildly gamey or slightly metallic, not fecal. If the odor is strong enough that you’d describe it as smelling like poop, the meat has likely been stored too long or experienced a break in the cold chain. Grass-fed lamb does have a stronger, earthier flavor and aroma than grain-fed lamb, but “earthy” and “fecal” are distinct. Trust your nose. If it smells wrong, it is wrong, and no amount of cooking will make it safe.
One other possibility with store-bought lamb: vacuum-sealed packaging can trap gases that create a concentrated funky smell when first opened. This should dissipate within 10 to 15 minutes of exposure to air. If the smell lingers or gets worse after airing out, the meat is spoiled.