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.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Why Chicken Bones Are More Dangerous for Cats Than Most Parents Realize

Chicken bones seem harmless enough, but for cats, they can cause serious damage quickly. Whether your cat swiped a piece off the counter...

Fantastic Pet Pantries and Where to Find Them

Let’s face it: times are really tough right now, and those of us in the 99% are struggling with the cost of just...

Ask Dr. Paola – Help! My Cat Refuses to Drink Water! (April 13, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

Why Healthy Cats Still Vomit Sometimes (And How to Respond)

A cat that just vomited needs a specific kind of care, and the feeding decisions you make in the next few hours actually...

More related

What Is the Flehmen Response in Cats? Our Vet Answers

Have you ever noticed your cat pull a disgusted face as if they have just smelt something horrible? Interestingly, this is a natural...

Ask Dr. Paola – Bee Stings, Dry Heaving & Feline Acne (January 12, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

How to Care for a Blind Cat: 7 Vet-Reviewed Tips

When your cat starts to lose their vision, you might start to worry about how much harder it will get to care for...

Black Ragdoll Cat Breed Info: Pictures, Temperament & Traits

Can Ragdolls be black? Interestingly, this issue still raises a lot of controversy in the Ragdoll community. Yes, there is such a thing...

Keep reading

Why Do Feral Cats Cry at Night – 7 Vet Reviewed Reasons

Have you ever been kept up at night with the sounds of cats vocalizing outside your bedroom window? We’ve all been there, which can be frustrating and disrupt our sleep patterns. If you have feral cat colonies or a stray...

Scared egyptian Mau cat at night in the shadow

Are Azaleas Poisonous to Cats? Vet-Reviewed Houseplants Examined

Azaleas are ornamental shrubs that are incredibly popular and loved by gardeners everywhere. Not only are they sturdy, resistant plants, but the flowers also turn stunning colors that range from a vibrant jewel color to a pretty, pale pastel hue....

Catster_Are Azaleas Poisonous to Cats

Can Cats Eat Chickpeas? Vet-Verified Nutrition Facts & Alternatives

The chickpea, or garbanzo bean, is a legume that originates from the Middle East and has gained the nickname of the Egyptian pea. They are considered high in protein, and they are sometimes added to commercial cat foods to increase...

Can Cats Eat Chickpeas

Can Cats Eat Dragonflies? Vet Approved Facts & FAQ

Cats love to chase things, especially things that fly quickly. It is one reason why so many birds die due to domestic cats every year (which can actually become a serious problem in some areas). Dragonflies are another animal that...

Can Cats Eat Dragonflies

Why Does My Cat Meow When I Pick Her Up? 4 Common Reasons (Vet-Verified)

Cats may meow for all sorts of reasons when you pick them up. In most cases, though, it is a sign of protest. Cats typically do not meow when they want to be picked up, but they may meow when...

young womn carrying her cat outdoors

Can Cats Eat Crackers? Vet-Verified Facts & Safe Alternatives

Our feline friends expend so much of their energy during the day playing or hunting down food. The more active their bodies get, the higher the metabolic rate. That means that they will eventually get exhausted and will need sustenance....

Can Cats Eat Crackers

Why Do Cats Hiss and Growl at Strangers? Vet-Reviewed Behavior Insights

Hissing and growling are ways cats communicate how they’re feeling. Hearing your cat hiss and growl can be shocking and a bit embarrassing if they’re doing it when you have house guests. Some cats may hiss and growl at strangers...

siamese cat hissing

How to Clean a Cat’s Butt: Vet-Approved Step-by-Step Guide

Cats are generally experts at cleaning themselves, butts included. But sometimes, your feline pal needs a little extra help in the hygiene department. Cleaning a cat’s butt is mildly unpleasant and can also be a health risk, so ensure you...

A-curled-cats-tail-close-up

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.