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 Does My Cat’s Pee Smell So Strong All of a Sudden? Vet Approved Facts & FAQ

man cleaning smelly litter box

While cat urine generally isn’t known for smelling great, it’s often a sign to be concerned about if your cat’s pee smells really strong all of a sudden, as it can indicate that something may be going on.

Conditions that can commonly cause stinky urine include urinary tract infections and diabetes. Urine that is more concentrated, or older and decomposing, will also reek more than normal. A veterinarian should always evaluate cats if their urine suddenly starts to stink, particularly if they’re also showing any signs of illness, such as suddenly peeing outside of the litter box, hiding, withdrawing, or eating more or less. We explain the possible reasons why your cat’s pee smells so bad and when you should take them to the vet.

divider cat paws oct 2024

What To Do About Strong Pee Smells

Cat urine has a very strong ammonia smell, and not only does it smell unpleasant and acrid, but it can also be an irritant for home residents. Apart from having the right cat litter, regularly cleaning the litter box and having it in a well-ventilated area, using a litter additive or deodorizer can significantly help combat litter box odors. An enzyme cleaner works wonders for pet messes and odors making it a great addition to your kitty cleaning routine.

Combating tough cat litter smells is an ongoing battle for pet parents but luckily, there are products out there designed to help! Two products that significantly reduce odors are the Hepper Litter Additive and the Hepper Enzyme Spray.

Image Product Details
Best Enzyme Cleaner Hepper Advanced Bio-Enzyme Pet Stain & Odor Eliminator Spray Hepper Advanced Bio-Enzyme Pet Stain & Odor Eliminator Spray
  • Works on multiple surfaces
  • Gentle yet effective
  • Lifts stains & set-in odors
  • Best Litter Additive Advanced Bio-Enzyme Cat Litter Deodorizer Advanced Bio-Enzyme Cat Litter Deodorizer
  • Neutralizes odor within cat litter
  • Cat-safe
  • Unscented
  • At Catster, we’ve admired Hepper for many years and decided to take a controlling ownership interest so that we could benefit from the outstanding designs of this cool cat company!

    divider 3 paws

    What Causes Urinary Tract Infections in Cats?

    Urinary tract infections, or UTIs, can cause an increase and change in the smell of a cat’s urine. UTIs are usually caused by a bacterial infection, and are not as common in cats as they are in some other animals.

    Other signs of a UTI, which are similar to other causes of urinary tract disease, include frequent trips to the litter box, straining to urinate, only passing small amounts of urine, bloody urine and discomfort. If you see any signs that your cat is having difficulty passing urine, then you must take them to your vet immediately. Male cats (and rarely females) can suffer from a blocked bladder, when they are unable to pee, and this is life threatening.

    Diagnosis usually involves urine testing to identify the precise cause and ruling out other conditions with similar signs. UTIs are commonly treated with antibiotics, increasing water intake and anti-inflammatory pain medication may be prescribed.

    a siamese cat getting examined by a vet at the clinic
    Image Credit: Sergey Nivens, Shutterstock

    What Is Diabetes?

    Diabetes is a disease in which a cat’s body has difficulty making or using insulin, a hormone that keeps blood sugar levels balanced. Insulin is required for the transport of the glucose (sugar) in the blood, to the cells of the body where it is needed for energy. When cats have diabetes, their cells can’t get hold of the glucose in the bloodstream, which leads to high blood sugar levels.

    Cats can have type I or type II diabetes. Type II diabetes is far more common in cats than Type I. Cats with Type II diabetes are unable to respond to the available insulin adequately (insulin resistance), and they may also have a reduction in the amount of insulin being produced.

    A strong fruity or sweet urine smell can be one of the indicators of feline diabetes, it is usually coupled with other signs that may be more obvious. These include drinking more than usual, excessive urination, normal to increased appetite, and weight loss. The diagnosis usually requires blood and urine tests to narrow things down, and the treatment usually involves long term injectable insulin therapy.

    divider 3 paws

    The Importance of Hydration

    Proper hydration is essential for cats’ overall health; it’s just as important as ensuring they have access to high-quality food. A stronger ammonia smell from fresh urine may signal more concentrated urine. A lack of fluid intake can be a predisposing factor in the development of feline urinary tract disease, including UTIs. Cats with diabetes (especially uncontrolled) urinate a lot and so need to drink a lot more water to compensate and prevent them from becoming dehydrated.

    Providing cats with fountains and giving them more wet food are two ways to boost their water intake.

    Fountains

    Close up to a grey and white kitten drinking water at the pet drinking fountain
    Image Credit: Patcharida, Shutterstock

    Many cats naturally prefer to drink running water, much like they would if left to their own devices. A cat fountain may encourage your feline to drink more. As an added bonus, most include filters that help keep the water fresh as it circulates; remember that they generally need to be changed pretty frequently.

    Fountains are available in several materials: ceramic, plastic, and stainless steel. Some models feature multiple tiers and pools to give cats several ways to drink.


    Wet Food

    cat eating wet tuna food
    Image Credit: Svetlana Rey, Shutterstock

    Increasing the amount of wet food in a cat’s diet is a simple way to boost their water intake. Wet food contains a high percentage of water; it’s often the first ingredient listed on the label of pates and choices with sauces and gravies.

    While there are always exceptions, cats usually love wet food. Make sure to follow the feeding instructions on the package to ensure your cat gets the right amount to eat since dry food tends to contain more calories per ounce than wet food.


    Bowl Set Up

    You can take a few steps to create a pleasant drinking environment for cats, which may increase their interest in hanging out and drinking more. Cats dislike having their water bowls placed close to their litter boxes or food sources, and many prefer not to drink from receptacles made of materials that retain odors over time, such as plastic.

    Stainless steel and ceramic models don’t harbor bacteria if properly cleaned and can be thrown in the dishwasher. Washing the water bowl daily will keep bacteria and smells away.

    If you are concerned or have questions about your cat’s health, you can also speak to a vet from the comfort of your own home to help make a plan. They can determine when an in-clinic vet visit should be made.

    If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

    PangoVet_Mention-in-Content for PangoVet2 save money

    divider cat paws oct 2024

    Frequently Asked Questions

    Which cat pee smells the worst?

    All cat urine will have some degree of smell, but male cats that have not been castrated are well known for having particularly pungent urine which is related to the hormones they eliminate when they pee. Older cats may also have smellier urine which can be a result of a loss of kidney function. Finally stale, old urine smells particularly strong as it decomposes over time.

    How to remove the smell of cat urine?

    As cat pee smells worse the longer it sits, clean the litter box regularly and clean up any urine elsewhere as quickly as possible. Enzyme based cleaners help get rid of the smell, but avoid any cleaning products that contain ammonia as if a cat smells it they may be more inclined to urinate in the same place again.

    Hepper Advanced Bio-Enzyme Pet Stain & Odor Eliminator Spray
    • ADVANCED ENZYMATIC CLEANER - Penetrates the most stubborn smells and stains at the deepest molecular...
    • FOR ANY MESS, ON ANY SURFACE - This pet odor eliminator cleans your carpets, floors, furniture,...
    • FRESH, NATURAL ODOR - Our unique formulation doesn't rely on dangerous or unpleasant chemical...

    At Catster, we’ve admired Hepper for many years and decided to take a controlling ownership interest so that we could benefit from the outstanding products of this cool cat company!

    divider 2 cats

    Conclusion

    All cat urine smells to some degree but a significant change or increase in smell may indicate a health problem, and should be assessed by a veterinarian. Conditions that may alter the odor of urine include diabetes and urinary tract infections, and more concentrated urine will have a stronger smell.

    As well as appropriate diagnosis and treatment from a veterinarian, having access to fresh water and encouraging cats to increase their intake, is vital for those suffering from many of the conditions that are related to stinky urine.

    See Also: 


    Featured Image Credit: xamnesiacx84, 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

    10 Tricks to Teach Your Cat: Vet-Approved Steps for Fun

    Have you been wanting to do something fun with your cat? Are the two of you tired of the same old games? If...

    200+ Blue Eyed Cat Names: Beautiful & Unique Ideas

    If you’re lucky enough to have a feline friend with piercing blue eyes, you’ll want to find the perfect name that captures their...

    Cat Strokes: Signs, Causes, Diagnosis, Care & FAQ (Vet Answer)

    Although relatively rare, cats experience strokes. A stroke occurs when there is an abrupt interruption in the blood supply to your cat’s brain....

    Can I Leave My Cat Alone for a Weekend? Vet Reviewed Facts & FAQ

    Any cat owner knows that cats are independent and self-reliant. Most cats nap during the day and eat when they want. They don’t...

    More related

    American Shorthair Cat Health Problems: 10 Common Issues

    The American Shorthair is a beautiful, affectionate breed of cat that makes a great companion for any family. However, like all breeds of...

    What Breed Is My Tabby Cat? How To Tell, Types & Helpful Tools

    Tabby cats have been around for centuries, going back to ancient Egypt and likely further. Where many people get confused, however, is thinking...

    Persian Kittens For Sale in Virginia: Breeders List 2025

    Catster advocates for adopting before shopping, though we fully understand there are many reasons for seeking a breeder. So, we encourage it to...

    Golden British Shorthair Cat: Info, Pictures, Facts & History

    Golden British Shorthair cats are gorgeous, round kitties with large heads and big hearts. They are rather large cats, and some large males...

    Keep reading

    I Just Adopted a Cat and They Won’t Stop Meowing: Vet-Reviewed Causes & Advice

    You want a new family member that will always comfort you in your ups and downs, but adopting a cat can be an overwhelming experience. Sometimes, your new cat will meow all night long, leaving you frustrated about what to...

    Ginger tabby young cat sitting on a wooden floor looks up, asks for food, meows

    5 Cat-Safe Incense Alternatives for Your Home: Vet Approved Advice

    Incense is used in many homes to freshen the air in the home and cover unpleasant smells. Unfortunately, it is generally not considered safe for homes with cats. The exposure to the smoke from the incense can be irritating to...

    Close up to Mint leaves in a pot

    4 Best Foods for Cats With Feline Leukemia in 2025 – Reviews & Top Picks

    Feline leukemia is an infectious virus that affects your cat’s immune system and is transmitted to other cats through their saliva, feces, or urine. Some cats infected with feline leukemia will have the disease for life, and unfortunately, there is...

    orange cat eating on an orange bowl

    8 Best Cat Foods With Taurine (2025) – Reviews & Top Picks

    When it comes to selecting the best cat food for your precious feline, it can seem like there are way too many options to choose from. While most of us know that a high protein diet is important for our...

    tabby cat eating from a bowl outside

    Maine Coon Cat Size: Info, Pictures & Height Comparison Chart (Vet-Verified)

    Maine Coons are known to be some of the biggest domestic cats there are. The breed originated in the US state Maine, where they had to face brutally cold winters, helping them develop into a rugged breed that’s fit for...

    big-blue-maine-coon-cat-in-forest

    Can Cats Eat Minnows? Vet-Reviewed Facts & FAQ

    If you’re a cat owner, you may have wondered whether your feline friend can snack on minnows. It’s a valid question. After all, fish are a natural part of their diet, in the wild, right? The answer is yes, so...

    Can Cats Eat Minnows

    Can Cats Eat Squid? Vet-Approved Nutrition Facts, Risks & Feeding Info

    Squid isn’t common table fare in all locations, but depending on where you’re at, it might be a popular dish. In America, squid is most commonly served fried with a side of marinara sauce in a dish known as calamari....

    Can Cats Eat Squid

    Does Steam Cleaning Kill Fleas? Vet-Approved Effectiveness & Safety Explored

    If your cat has fleas and they’ve also infested your home, we feel your pain. If you’re contemplating reaching for the phone to call in a steam cleaner, it’s important to note that using a steam cleaner will indeed kill...

    cleaning sofa with a steam cleaner