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

Chatting About the Rainbow Bridge, Euthanasia, and Laughter During Grief | Chatty Cattys, Episode 24

If you’ve ever felt the loss of a beloved cat, or are dreading the day when your pet crosses the rainbow bridge, you’ll...

The Simple Reasons Cats Refuse to Let Anyone Use the Bathroom Alone

Cats have an extraordinary talent for making themselves present in the most inconvenient places, and the bathroom ranks near the top of the...

A Paw-sitive Milestone: Canada Officially Becomes a Declaw-Free Nation

Canada has officially become a declaw-free nation. On May 25, 2026, a new regulation was filed in Ontario under the Provincial Animal Welfare...

The Surprisingly Simple Ways to Help a Cat With Hairballs

Cats spend an astonishing amount of time grooming. It is part hygiene routine, part comfort ritual, and part instinct that traces back generations....

More related

Why Is My Cat Standing on His Hind Legs? Possible Reasons & When To Be Concerned (Vet-Verified)

It’s not uncommon for cat owners to catch their cats doing crazy things, like chasing their tails or staring wide-eyed into the distance....

Why Cat Ear Sores Shouldn’t Be Ignored (Even Small Ones)

You’re giving your cat a head scratch when your fingers catch on something rough. You pull your hand back and look closer –...

PETKIT Purobot Ultra Litter Box Review 2026: Our Hands-On Test

Whether you have multiple cats and are looking for a better way to deal with litter odor or are worried your cat might...

Why Does My Cat Smell Bad? 17 Vet-Reviewed Reasons & Solutions

You know how unpleasant it can be when your feline friend starts to smell bad, especially if they like to jump into your...

Keep reading

Can Bird Mites Live on Cats? Vet-Verified Facts & Tips

Bird mites are parasites that feed on the blood of avian hosts. While they can’t survive off of feline blood alone, they can still cause irritation for cats for a couple of weeks. So, it’s best to address the issue...

Cat wearing collar scratching and itching

How Can I Talk With a Vet When It’s in the Middle of the Night? 5 Ideas & Online Vet Options

Cats are curious animals, and they tend to have active periods at night. This can cause them to get into accidents or get injured, and it can be difficult to contact your veterinarian because their clinic is closed in the...

woman using a laptop on couch with her cat

What to Feed an Old Cat to Gain Weight: 5 Vet-Approved Tips

While to a certain extent, it’s normal for a cat to lose weight during their senior years, it’s also essential for you, as a pet parent, to do everything that you can to tempt their appetite and keep them as...

tabby cat eating from metal bowl

8 Possible Signs Your Cat Is Protecting You

You might be surprised to discover that cats are territorial and spend most of their time guarding their territory, which includes your house and, usually, you! There have even been cases of cats attacking intruders or animals threatening their family...

Domestic cat lying on owner's lap

My Older Cat Is Losing Weight: 10 Vet-Reviewed Reasons

​​The average feline lifespan has increased over the years, and today, it’s not uncommon to meet cats that are 18, 19, 20, and even 20+ years old! And while they are considered “seniors” at the ripe old age of 11-14...

sick skinny cat in the veterinary clinic

Can Cats Drink Vinegar? Vet-Verified Health & Safety Facts

Vinegar is one of those pantry staples that most people have in their kitchens. It can be used in salads, marinades, and homemade cleaners. Some people even add a splash of apple cider vinegar to their water for its researched...

Can Cats Drink Vinegar

How Long Do Savannah Cats Live? Average Lifespan, Data & Care

Savannah cats are beautiful hybrid spotted cats with long legs and distinctive, large ears. The hind legs are usually just a bit longer than the front legs in this breed, giving them a distinctive silhouette and gait. Savannahs are a...

Cat Savannah F1 sitting on the stairs

Feline Idiopathic Cystitis in Cats: Signs, Causes, and Care

Urinary tract diseases are fairly common in cats, so it’s important for cat owners to be well-informed about this area of cat health. Cats can contract several different kinds of urinary tract diseases. Veterinarians will conduct tests to diagnose the...

cat pee on carpet

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.