Top 10 Most Smelly Animal Poos
You clicked. That means you saw a list about the most pungent piles of animal poop and thought, "Yeah, I need to know more about this." Bold move. Respect.
Now before you ask, yes, this list was actually mentioned in an episode of Dan Cummins' Timesuck podcast. Nothing says "prestige" quite like being recognized during a deep dive into the bizarre, the gross, and the wonderfully stupid. Imagine the brainstorming session that led to this gem: "We've ranked songs, foods, and superheroes... what if we ranked feces by sheer nose-burning power?" And here we are.
You've got the power to decide which creature's rear-end exports truly deserve to be enshrined in olfactory infamy. This isn't about science. This is about suffering. Eye-watering, soul-crushing, peel-the-paint-off-the-walls kind of stink. So vote. Vote like your nostrils depend on it. Because enough people already have, and apparently this topic was overdue for a little recognition and a lot of air freshener.
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Human poo
It's bad enough that you have to smell this every day when you use the bathroom.
Human crap smells a whole lot worse because people eat wider varieties of food.
Your poo is the champion in smelliness. Your pets, whom you think have smelly poops, are not.
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Horse poo
Fresh horse manure piles reek to high heaven and attract swarms of flies. Every time I shovel up a pile fresh out of the horse, the smell is so bad I need to breathe through my mouth or put a clothespin on my nose.
It just has a very nasty sweet smell, and it smells like old peaches.
My pastor has horses. Let's just say it smells like cat poo times three.
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Cow poo
I went on a field trip to a cow farm, and it stank so bad I threw up on a cow, and it made it really mad. It mooed in my face and pooped more as my reward!
I guess it knows its poo smells!
Cow poop is terrible! It smells like a skunk sprayed itself, got eaten by a bear, was vomited up, then eaten again and finally pooped out!
I really like cows, except for what they excrete from their behinds. It's not right. And my poop doesn't smell that bad.
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Pig poo
The smell of pig feces on a hot summer day can actually burn the nostrils. It's relentless!
Oh frick, this smells bad.
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Dog poo
This should be at number one, not human poo. We smell human poo every day to the point that we're used to it. Dog poop is way worse.
Have you ever stepped in this crap? It smells horrible! It's so bad that pigs have died because of the smell.
It's because they eat meat byproducts and trash. You are what you eat, and you fart what you eat.
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Cat poo
I have two cats and a whole room with a bunch of litter boxes. Don't ask me how bad it smells! One time my babysitter came over and was playing hide-and-seek. She hid in the room and had to take a shower afterward because she still smelled horrible.
I have two cats. They poop a lot. I was once changing the litter, and as soon as I finished, they both walked in and pooped right in front of me. It smelled so bad I had to run downstairs. I couldn't get the smell out of my nose!
Cat poop is the worst I have smelled. Dog poo, human poo, and baby poo. I can say with confidence that cat poo is the worst.
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Elephant poo
I was mowing my lawn today, and a spot of grass where a pool was was all moist and swampy, and made the most distinct smell ever. Yep, elephant crap.
I go to the elephant house all the time, and it is stinky.
I can imagine it being used for a poo bucket challenge.
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Monkey poo
At the zoo, it smells a little like human poo.
Monkeys are awesome, except they are the stinkiest animals in the zoo. Pu!
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Goat poo
When I was hiking, a goat was pooing in the way. The poop smelled bad, so we went the longer way.
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Rhino poo
Once, I was at the zoo, and there was this rhino. He had his back to the gates, so I stared at that for a while. Then, he started to make a very slimy poo. It landed all over me!
It smelled really bad, and I looked like a smelly swamp monster. It was so embarrassing, and everyone laughed. Worse still, one of my friends at school saw me too.
They told everyone at my school. I was called "poo-poo boy" for three weeks.
One time, my sister was at the zoo, and this rhino just pooed right in front of her. The entire house that the rhino was in smelled so bad. Now she knows not to go messing around with rhinos, even though she didn't know she was making it mad.
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Woodchuck poo
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Dik-dik poo
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Skunk poo
Well, it might not be the poo, but whoever gets close enough for a whiff can't tell the difference!
Skunk poop is yuck. I saw a skunk that pooped in my garden, and it smelled disgusting for 7 months!
As if skunks didn't stink enough already, their poop is really nasty.
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Chicken poo
This offensive odor is an entity all its own. I believe smelling chicken feces could kill cancer cells in the human body better than radiation and chemotherapy combined.
The worst smell around is a large commercial chicken coop. You can smell it for miles.
Chickens somehow manage to take a poo bigger than themselves. They stink!
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Lion poo
One time at the zoo, it literally smelled so bad that I had to use my mouth to breathe. That's usually a sign where things start to smell really bad because only expired, crushed milk smells worse than lion crap.
Stinkier than any poo in the animal kingdom. It's the nastiest poo in the world because they eat meat.
Ewww, Simba is pooping, and Kovu too. They are stinky poop in the Pride Lands.
Even Nala pooped on it, and Kiara too!
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Fox poo
If your dog has ever rolled in this, you'll know how bad the smell is. You can only get rid of it by adding tomato sauce into the mix. Yuk!
The stench lingers in the nostrils for hours.
Why isn't it even on here, let alone first?
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Crocodile poo
I am a zookeeper. The 1-meter-long saltwater crocodile I cleaned up after today had the most revolting smell in existence. I'm feeling nauseous thinking about it. You know that physical reaction you have to smelling something truly awful? Okay, imagine that intensity of a reaction but times it by three.
I gagged twice and honestly thought I was going to make more mess and spray all over the floor in front of the public. I was trying to act normal because people were watching me - well, from a distance. They had all backed away within seconds, to at least 6 meters away from me. I guess they couldn't stand the smell either! It smelled like human poo/rotting flesh/something truly horrific. I recommend taking my word for it and not trying to ever experience this smell on purpose. Avoid at all costs!
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Guinea pig poo
These ugly vermin have the stinkiest poo in the animal kingdom! My friend has one, and it stinks up his whole house in mere seconds! Ugly rat!
I used to have one, and even after I cleaned its cage, it would start crapping all over, and I could smell it from my room!
I had a Guinea pig once, and my parents called them Guinea Farts.
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Duck poo
If you hear a quack, then watch your back.
So bad. It smells like death.
Duck poo smells very bad.
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Alligator poo
Let's just say I have a very bad experience with alligator poop.
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Bear poo
A big black bear pooped right on my driveway here in the Southern California mountains near Big Bear just this morning. The smell was horrendous. I think he/she had been holding it all winter.
I went camping once, and in the middle of the night, a bear pooed right next to my tent.
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Hippopotamus poo
If you get a pet hippo, its poo smells so bad, but it doesn't seem to bother me at all.
Yes, it does.
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Bat poo
This needs to be higher.
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Rabbit poo
Smells horrible.
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Mouse poo
It can smell bad after eating fruits and veg. My pet mouse lets out some great stinkers.
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Turkey poo
Smells like skunk.
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Sheep poo
More Info
Why does some animal poop smell so much worse than others?
Because not all turds are created equal. Diet matters, gut microbes matter, moisture matters, and the chemical cocktail coming off the pile matters a whole lot. Researchers studying animal manure odors point to compounds like ammonia, hydrogen sulfide, volatile fatty acids, indoles, skatole, and phenols as major stink players. That is a rough lineup of the foul-smelling Avengers, except nobody wants them assembled.
Also, fresh poop and old poop can be two very different monsters. Once microbes get to work breaking waste down, the smell can shift, intensify, and spread like it has a personal grudge against your nose. Heat and moisture can make the whole situation even more aggressive, which is bad news for anyone standing nearby pretending they are “fine.”
Why is cat poop famous for being so unbelievably nasty?
Because cats are tiny, judgmental meat missiles, and their diet does not exactly lead to daisy-scented results. Studies on cat feces have found volatile fatty acids, phenolic compounds, and sulfur compounds contributing to odor. Translation: the litter box is running a small chemical weapons program.
That helps explain why cat poo ranks near the top. It is not just that it smells bad. It smells concentrated. Focused. Personal. A horse may produce more volume, but a cat can make one small deposit that takes over an entire room like it pays rent there.
Do carnivores usually have worse-smelling poop than herbivores?
A lot of the time, yes. Meat-heavy diets tend to produce nastier-smelling feces because protein fermentation in the gut can generate especially pungent compounds. One animal gut health explainer notes that dogs and cats on high-protein, meat-based diets typically have greater fecal odor, and a wildlife study even remarks that carnivore feces are generally more pungent than herbivore feces.
That said, herbivores should not get too smug. Volume, wetness, storage conditions, and sheer staying power can make plant-eater poop horrifying in its own special way. It is less “assassin” and more “crop-dusting event.”
Why does horse manure seem to be everywhere and smell forever?
Because horses do not do anything halfway, including bathroom breaks. Extension guidance on horse manure notes that odors and flies are among the most common complaints, and fresh manure can definitely attract both. So when a big animal drops a big pile and leaves it sitting there in warm conditions, your nose is going to hear about it.
Horse manure also wins by persistence. One tiny foul poop is bad. A field full of fresh steaming reminders that gravity is real is something else entirely.
Why does chicken poop have that sharp, eye-watering smell?
Bird waste plays by different rules. Poultry excrete nitrogen largely as uric acid, and when microbes break that down, ammonia forms. Ammonia is the part that gives poultry waste that harsh, throat-punching quality that seems less like an odor and more like a warning.
That is why chicken poo often feels weirdly stronger than people expect from such a small animal. It is not about the size of the bird. It is about the fact that the smell can hit with the energy of a full chemical betrayal.
Why does pig poop have such a brutal reputation?
Pig waste has been studied a lot because swine operations can generate serious odor complaints, and the science backs up the drama. Swine manure odor is linked to compounds such as hydrogen sulfide, ammonia, phenols, indoles, and volatile fatty acids. In plain English, pig poop is not messing around.
There is also the environmental factor. A little pig poop is bad enough. A lot of pig waste in heat, humidity, and storage conditions that let it ferment into something straight from the underworld is the sort of thing that convinces people to reevaluate every life choice that brought them downwind of it.
Can healthy animal poop still smell absolutely horrible?
Oh, absolutely. Healthy does not mean pleasant. A perfectly normal bowel movement can still smell like a crime scene, especially if the animal is large, eating a high-protein diet, or producing waste that breaks down into especially pungent compounds. Odor alone is not a reliable way to judge health.
Now, if the smell changes suddenly, gets much worse than usual, or comes with diarrhea, blood, or other signs something is off, that is a different story. But ordinary and disgusting can coexist just fine. Nature is beautiful like that. Hideous, but beautiful.
Why does zoo poop seem extra evil?
Because zoos combine some of the stinkiest variables on Earth. Big animals. Mixed diets. Warm enclosures. Repeated deposits in the same area. Sometimes water. Sometimes bedding. Sometimes a smell that settles into the air and starts paying property taxes.
Also, proximity matters. A smell that might seem manageable in the wild becomes a full sensory mugging when you are near an enclosure, trapped on a path, holding a melting pretzel, trying to act normal in front of children.