Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Why Do My Cat’s Farts Smell Like Eggs? Our Vet Explains

Share

Cat Stinky

Have you ever noticed that your cat’s farts smell like rotten eggs? Is there a way to prevent this unpleasant scent? That rotten egg odor is primarily due to sulfur compounds produced in the digestive process. When cats eat certain foods, especially those rich in fiber or specific types of carbohydrates, their digestion can lead to the production of gases that have a uniquely smelly odor.

divider 2 cats

Causes of Smelly Farts in Cats

Cats can have varying amounts of gas accumulate in their digestive systems, and certain factors can play a role in the production of odorous farts. Cats with sensitive digestive systems or food allergies can produce particularly stinky gas. Some cats may have difficulty digesting specific ingredients, leading to gastrointestinal distress and the production of gas.

Since cats are obligate carnivores, their digestive system is designed to efficiently process animal protein. So, dairy products, high amounts of carbohydrates or fiber, or low-quality ingredients can cause excess gas and smelly odors.

Many adult cats are lactose intolerant, meaning they have difficulty digesting lactose-containing foods properly. As a result, you may notice the unpleasant scent of rotten eggs. Sudden changes in your cat’s diet can lead to digestive upset, which can produce smelly farts. Eating spoiled food can also lead to a more prominent sulfur smell in their flatulence.

The microbes living in your cat’s intestinal system can impact the production of gases. A healthy microbiome can digest foods efficiently, thus producing less gas and pungent odor. Dysbiosis, or an imbalance of microbiomes, can produce smellier gas as a by-product of digestion, which is why you may notice a smell similar to that of rotten eggs. Medical conditions, such as infections, inflammatory bowel disease, or intestinal parasites, can upset normal digestion, leading to foul-smelling farts.

Other factors can influence flatulence, such as how fast your cat eats. Kitties that quickly gobble down their food can swallow air, which may lead to an excess of gas in their gastrointestinal tract.

woman with smelly cat
Image By: Jihan Nafiaa Zahri, Shutterstock

How to Prevent Your Cat From Having Smelly Farts

If your cat’s farts continue to be particularly smelly or occur in addition to vomiting or diarrhea, a checkup with your veterinarian may be worthwhile in order to rule out any underlying medical conditions or dietary indiscretions. It can be particularly useful to help you manage your cat’s diet and ensure a healthy digestive tract.

Dietary changes to include more high-quality protein depending on your cat’s age, health, and lifestyle can reduce excessive gas. All new diets should be slowly transitioned over a period of 7 to 10 days to prevent digestive upset. The addition of a species-specific probiotic can contribute to a healthy microbiome. Serving smaller, more frequent meals daily can also help digestion more than a single large meal.

Play and exercise can help your cat’s digestive system move along more efficiently. Aim for two 15-minute sessions per day.

Russian Blue Cat eating
Image By: slawomir.gawryluk, Shutterstock

divider 2 catsConclusion

Farts with foul smells resembling rotten eggs in cats can be attributed to various factors, such as their dietary choices, food intolerances or allergies, the condition of their microbiome, and their eating habits. Once you understand these factors, you can take appropriate steps to reduce stinky and potentially embarrassing odors from your cat.


Featured Image Credit: Stanislaw Mikulski, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Kizzy: The Feline Princess With a Purpose

We were first introduced to Miss Kizzy after she won a licky-treat challenge hosted by Professor Fluffovich, our resident feline research specialist. While...

Chatting With Sally About Mission Meow & Helping Cat Rescue Organizations Collaborate | Chatty Cattys, Episode 24

In this episode of Catster’s podcast, Chatty Cattys, Nicole and Dr. Karyn sit down with Sally Williams, the founder of Mission Meow, for...

Vets Urge Owners: Don’t Ignore Sweet Smell Coming From Cats

Cats are not particularly known for having a pleasant aroma. The occasional whiff of fishy cat breath and that unmistakable post-litter-box scent simply...

“A Cat Spay Costs How Much???”

America has a kitten problem. Every day, thousands of cats and kittens are abandoned, surrendered, or discarded. Those who are lucky enough to...

More related

9 DIY Cat Treadmills You Can Build Today (With Pictures)

In the wild, cats are ferocious hunters that rule the forest, jungle, or savanna in which they live. As they have become more...

‘Inside the Mind of a Cat’ Netflix Documentary Review 2026: Pros & Cons

A recently released documentary on Netflix is trying to change how we look at cats. A group of feline specialists and a passionate...

Lyme Disease in Cats: Causes, Signs & Treatments (Vet Answer)

Lyme disease is a bacterial infection caused by the bacteria Borrelia burgdorferi. Animals and humans become infected via the bite of a tick....

10 Top Cat Cafes in the US in 2026

Cat cafes are wonderful establishments that promote cat adoption and animal advocacy. They host and house adoptable cats and provide a safe environment...

Keep reading

Are My Cats Playing or Fighting? 6 Vet-Reviewed Ways to Tell the Difference

Cats love to wrestle and play, but they also fight. Even if you have two litter siblings that have lived together their whole lives without any problems, there is a chance that something can change. One might get carried away,...

cats in grass

How to Remove a Tick From a Cat: Vet-Approved Steps & Advice

Removing a tick from a cat is not difficult, but it may not be as easy as you think. The hardest part is keeping your cat still, but the process is quite simple with a tick removal tool. You must...

removed tick from cat

Nature’s Variety Instinct Cat Food Review of 2026: Recalls, Pros & Cons

Review Summary Nature’s Variety is the brand behind Instinct cat foods, available as wet canned food, dry kibble, and toppers. Its inspiration is knowing that raw diets have the potential to provide your cat with many different health benefits. It’s...

Instinct Cat Food Review

Why Do Cats Fall Over in a Harness? Our Vet Explains

Trigger Warning: The study described below includes harm done to cats in a laboratory setting and may be upsetting to some readers. Please proceed with caution. Keeping a cat indoors is proven to increase their lifespan and reduce the risks...

cat with harness sitting in the garden

Are Bell Collars Bad for a Cat’s Hearing? Vet-Verified Facts & FAQ

Bell collars are very popular among cat owners because the cute little jingle allows anyone around to know the cat is nearby. It’s no secret that these types of collars can make anxious cats very uncomfortable by the random sound...

woman-wearing-collar-to-her-cat

Why Do Cats Like Q Tips? 3 Possible Reasons & Vet-Reviewed Safety Tips

If you have ever noticed your cat chasing after strange objects and trying to chew on them, you probably understand how fun it is for cats to play around with Q tips. In your cat’s mind, Q tips are strangely...

Wooden cotton swabs and the paw of a gray cat on bright yellow background

Why Do Cats Roll Around on Their Backs? 7 Vet-Reviewed Reasons (With Infographic)

Cats are peculiar creatures and usually march to the beat of their own drum. Unlike dogs, cats can be particular, especially regarding their bellies. When a dog rolls over on their back and exposes their belly, the dog likely wants...

Fluffy domestic cat stretching on the sofa

Russian Blue Cat Health Problems: 7 Vet-Reviewed Issues

Russian Blues are a beautiful cat breed known for their playful demeanor and highly intelligent mind. They’re great for families looking for a cat that can hold its own and won’t need constant attention and affection from its owners. If...

Catster_Health Problems of Russian Blue

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.