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

Your Cat Isn’t Picky – Their Nose Is Just Bored

If you’ve ever sighed while scraping uneaten cat food into the trash, you’re certainly not alone. Many cat owners know the routine: their...

Ask Dr. Paola – Help! My Kitten Won’t Use the Litter Box! (July 27, 2026)

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

Chatting with Petra Luna About CatCrazy, Cat Food Ingredients & The Secret of E-Beams | Chatty Cattys, Episode 28

In this episode of Catster’s Chatty Cattys podcast, Nicole and Dr. Karyn welcome back Petra Luna from CatCrazy to catch up on her...

According to Vets, Most Owners Miss These Signs That a Cat is Sick

Cats are famously good at hiding discomfort. It is not stubbornness or indifference; it’s a deeply ingrained survival instinct. In the wild, showing...

More related

9 Best Cat Toys for Exercising Your Cat (2026) – Reviews & Top Picks

We often think of dogs as needing a lot of exercise, but it is also true that cats need a workout just as...

LaPerm Cat: Breed Info, Pictures, Traits & Facts

The cat kingdom has truly fascinating cat breeds, one of which is the LaPerm, which stands out for their curly coat. These unique-looking...

How Long Does It Take to Neuter a Cat? All You Need to Know (With Vet-Approved Information)

Any surgical procedure done to your pet can seem like it lasts forever. After all, most people hate being away from their pets,...

Ask Dr. Paola – Travel, Biting & Kissing (December 8, 2025)

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

Keep reading

What Do Feral Cats Eat in The Wild? Vet Reviewed Facts & FAQ

Feral cats aren’t domesticated, prefer living outdoors, and often avoid human contact. They are normally considered mesopredators in their ecosystems and are most active after dusk. In addition, since they reproduce rapidly and are skilled hunters, conservationists find them devastating...

cat hunting a rat

Why Do Cats Like Their Butt Patted? 7 Vet-Reviewed Reasons

No matter how much we love them, no one can deny that cats can do strange things. They are daredevils who enjoy high places. They fixate on the smallest things and can sit there for hours, seemingly staring at nothing....

cat wearing fabric collar looking camera and lying on the pillow when owner hand patting back

Can Cats Eat Fish Bones? Vet-Reviewed Feeding Facts

Cats are obligate carnivores. In the wild, they eat a good variety of small prey, depending on availability, and they make the most of their catch by eating all of their quarry. Prey are usually small mammals and birds, and...

Can Cats Eat Fish Bones

10 Best Cat Foods for Nursing Mother Cats in Canada 2026: Reviews & Top Picks

Taking care of any cat means being attuned to their health and their happiness. When cats go through different stages of life, a change in diet is usually required. The diet of a kitten is different from that of an...

Gray mother cat feeding kittens while taking a nap

Rachael Ray Nutrish Cat Food Review of 2026: Recalls, Pros & Cons

Review Summary Chef Rachael Ray shifted her focus from creating cuisine in the kitchen to extending her passion to animals. After deciding that she wanted her beloved Pit Bull, Isaboo, to enjoy the same kind of delicious nutrition she cooked...

Rachael Ray Nutrish Cat Food Review

How to Find a Cat-Friendly Vet: 5 Vet-Reviewed Steps

If you’ve just moved or recently adopted a cat, and you’re looking for a vet to take them to for their checkups and medical emergencies, there are some surefire ways to determine if a vet is good for you and...

vet and assistant holding cats

5 Homemade Cat Food Recipes (Vet Approved)

If you’re worried about what goes into your cat’s food, making it yourself can seem like the perfect solution. However, creating a nutritionally complete and balanced diet for cats is far more complex than it appears. Cats have very specific...

Homemade Cat Food Recipes

Top 9 Healthiest Cat Foods in 2026 (Top Ingredients & Brands)

We all want our cats to be as healthy as possible and part of that comes from choosing the correct food for our cats. For our cats to be as healthy as possible, we need to select the healthiest food...

cat eating kibbles from red bowl

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.