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 Cat Pee Smell Like Ammonia? 5 Vet-Reviewed Reasons

woman covering nose while cleaning the litter box

Cat owners who use effective cat litter and clean the litter box frequently don’t tend to have issues with cat urine odor. However, some cat owners still struggle to manage the prominent odor of their cat’s urine.

So what is causing this? Does cat pee have ammonia? Indeed it does, and this is where it gets it’s distinct scent, but it’s not overpowering in healthy cats. There are five likely reasons that your cat’s urine creates a strong odor. In this article, we will discuss these possibilities so that you can make your home smell fresh and clean again.

divider 3 paws

The 5 Reasons Why Cat Urine Smells Like Ammonia

1. The Urine Has Been There a Long Time

If your cat’s litter box has a pungent odor, consider how long the urine has been left there. Cat urine, when left uncleaned for long periods, will eventually give off a pungent stench.

Some cat litters do a good job of masking these odors, but if left long enough, the stench will eventually overpower the litter. Cleaning your cat’s litter box regularly will keep the odor at bay. If you already clean your cat’s litter box on a regular basis, check your house for signs that your cat may have urinated outside of the litter box.

siamese cat sitting next to enclosed litter box
Image Credit by: Axel Bueckert, Shutterstock

2. Your Male Cat Is Unneutered

Unneutered male cats have stronger-smelling urine than the average cat. Unfixed male cats have powerful hormones that are eliminated along with their urine. When an unneutered male cat urinates somewhere, the stench is incredibly difficult to remove.

Neutering your cat can minimize the stench of his urine, and it has other benefits. Neutered cats display fewer behavioral issues, such as aggression and roaming. To have your cat neutered, talk to your vet about when the procedure would be right for your pet.


3. Your Cat Has Urinated Outside the Box

When cats urinate outside the litter box, there is nothing to mask the odor. For instance, if your cat is injured and it affects their mobility, they may go to the bathroom on the floor if the litter box is difficult to access. When they go in several places in your house, the ammonia odor will increase until you clean the areas thoroughly. Cats may also urinate over the edge of the box if it is too small, or outside the box if they have an infection, or don’t like the litter or box location.

cat sniffing litter in the box
Image Credit: Duet PandG, Shutterstock

4. Your Cat Has a Urinary Tract Infection

Unfortunately, urinary tract infections are common health issues in cats, and they can cause changes in how urine smells. If your cat’s bathroom habits change, taking them to your veterinarian is vital since a urinary infection can worsen and cause other severe conditions.

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


5. Your Cat’s Litter Isn’t Designed to Fight Odors

Although cat litter products seem fairly straightforward, some brands are more effective than others. Cat litter can be made from clay, crystals, recycled paper, wheat, and other materials.

If you can smell your cat’s urine from the litter box, check the litter you use to verify whether it suppresses odors. If it doesn’t, switching your litter to a type that can cover odors may help.

divider 3 paws

Cleaning Cat Urine Properly

To keep your cat’s litter box from becoming smelly, scoop it every day or more and change the litter entirely every other week. Before filling the box, scrub it with soap and water to remove the stains and odors.

If your cat has urinated outside the litter box, you’ll need to clean the urine as soon as possible. The longer the urine stays, the worse the stench will become. Cleaning the urine properly ensures your cat doesn’t return to the soiled spot to urinate again.

An enzyme cleaner will be necessary to fully break down the urine, eliminating the odor and reducing the chances that your cat will return to urinate at that spot again.

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!

    Monitoring Your Cat’s Bathroom Habits

    Taking your cat to the veterinarian is the first step when you notice their bathroom habits have changed. If you scoop the litter daily and frequently clean the box, and yet their cat pee still smells like ammonia, this may indicate a health issue.

    You can buy litter that changes color when the urine’s composition changes, but it’s better to monitor your cat’s habits closely, maintain regular veterinary appointments, provide healthy food and fresh water, and follow your veterinarian’s treatment if they’re sick or injured.

    divider cat faces oct 2024

    Final Thoughts

    Cat ownership comes with pleasant experiences, but cleaning up urine isn’t among them. However, with a diligent cleaning schedule and high-quality cat litter, the odor of your cat’s urine shouldn’t carry throughout the house. If your cat’s urine smells like ammonia or starts to smell very strongly in general, reach out to your vet to rule out the possibility of a medical issue.


    Featured Image Credit: catinsyrup, 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

    2 Responses

    1. Are there any products I can purchase for my cat, she will sometimes have a strong ammonia smell when she urinates.She only eats dry food, don't like wet about 1/2 cup a day and treats. It's NOT everytime. She is 9 yrs old, and is NOT a friendly cat to be handled my strangers. She will hiss and bite if she doesn't know who is handling her. I would greatly appreciate any products I can try.
      Thank You

      1. Hi Maryann, cats on dry food only are often dehydrated and your cat might benefit from a water fountain, here are our reviews of the best ones: Best Cat Water Fountains- https://www.catster.com/lifestyle/best-cat-water-fountains/. You can also learn some of the benefits here: Do Cats Need Water Fountains?- https://www.catster.com/cat-health-care/do-cats-need-water-fountains/. If that is the case, drinking more water should help. It sounds like a challenge but consider getting your cat to the vet for a check, the smell might be indicating a health problem. You can also book a videocall with www.pangovet.com to provide specific support guiding you to find and narrow down possible causes. Lastly, we recommend using an enzymatic spray to remove the strong smell, here is a review of the 10 Best Enzyme Cleaners for Cat Urine & Odor – https://www.catster.com/lifestyle/best-enzyme-cleaner-for-cat-urine/
        Good luck!

    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

    Does Black Pepper Keep Cats Away? Vet-Reviewed Facts & FAQ

    While cats are adorable animals, if you’re not a cat lover, you don’t want the smell of urine and feces from the neighborhood...

    Why Does My Cat Keep Getting UTIs? 7 Vet Reviewed Reasons

    Although feline urinary tract infections (UTIs) aren’t common in cats, it can be terrifying if one strikes your feline companion. While UTIs are...

    13 Rarest Cat Patterns & Coat Colors (With Pictures)

    We’ve all seen plenty of cats in our lifetimes and know that they come in a wide range of colors and patterns. There...

    Can Cats Eat Pineapple? Vet-Approved Nutritional Facts

    Some cats will eat their meals every day and barely even notice the human food around them, but others are more adventurous. If...

    More related

    Can Cats Eat Goat Cheese? Vet-Reviewed Nutritional Benefits & FAQ

    As responsible cat parents, many people often wonder which treats are both safe and nutritious for their feline friends. While there’s an array...

    Can Cats Eat Cereal? Vet-Verified Nutrition Facts & FAQ

    If you can’t resist sharing the last of your cereal and milk with your cat, you might wonder if this is a good...

    Dealing With an Aggressive Cat? 7 Reasons Why Cats Become Aggressive

    Even the most experienced cat caretakers can find themselves charged up on adrenalin when having to face a cat in the midst of...

    Can a Blood Test Show Cancer in Cats? Vet-Reviewed Facts & FAQ

    As with humans, cancer is a leading killer of cats. Though the disease can be difficult to detect in felines, researchers are now...

    Keep reading

    What’s the Price of Spaying or Neutering a Cat in Canada? 2025 Costs

    If you don’t want to breed cats, it’s essential to consider a spaying or neutering procedure. While felines aren’t as expensive to own as canines, the costs still adds up. It’s also something you can do to reduce your pet’s...

    neutering cat on a vet's operating table

    Can Cats Eat Grass? Vet Approved Info & Facts

    Cats are no strangers to odd behaviors, but as owners it is easy to worry because our feline friends do not always put their safety at the top of the list. It is quite common to see cats munching on...

    Can Cats Eat Grass

    Does Cedarwood Oil Kill Fleas on Cats? Vet-Verified Effectiveness & Safety Explained

    Fleas can be the bane of a cat owner’s existence. Once they appear, they’re everywhere, and worst of all, they make our kitties miserable. Getting rid of fleas can be an arduous task. While plenty of flea control and prevention...

    cedar chips and essential oil

    10 Best Cat Litters in Canada in 2025 – Reviews & Top Picks

    Finding the right cat litter for your cat, let alone yourself, is definitely one of the more important purchases that you make as a cat owner. Do you want to scoop it, and do you prefer scented or unscented? Most...

    red haired cat in litter box

    How to Stop a Cat From Overeating: 9 Vet-Approved Tips & Tricks

    Everyone wants their furry feline family member to be happy and satisfied, and your cat having a fulfilled and healthy appetite is part of them living a well-balanced life. However, a good appetite doesn’t mean they should be consuming more...

    persian cat eating dry food

    Why Does My Cat Chew on My Fingers? 8 Vet-Verified Reasons

    Cats do weird things sometimes, and if your cat has ever tried to chew on your fingers, you might be wondering what on earth has gotten into them. Some cats might choose to chew plastic; for others, their owners’ fingers...

    Gray Cat bitting hand

    What to Feed a Diabetic Cat to Gain Weight: Vet-Reviewed Health Tips

    Diabetes has become an epidemic, not just in people but also in pets. Feline diabetes is most similar to type 2 diabetes in humans, meaning that weight management and diet are critical factors in controlling the condition. Cats with diabetes...

    cat thin

    Cat Pregnancy Timeline & Stages: Vet-Verified Week-by-Week Facts

    Cats evolved to get pregnant very quickly, and the act of mating stimulates the release of eggs from the ovaries. So the odds of them getting pregnant are very high. Usually, the average feline pregnancy takes about 60 to 65...

    Pregnant cat laying on a staircase