Skip to Content

Why Is My Cat Drinking So Much Water? | Cat Drinking a Lot of Water

Why is my cat drinking so much water? If your cat is drinking too much H2O, then he may just be trying to tell you something other than that he’s thirsty.

Cats who drink too much can have serious medical issues that need attention right away.  Though sometimes the reason why your cat is drinking too much is due to serious problems, sometimes it can just mean he is not getting enough water from his diet.

Let’s see the reasons and causes below for why some cats seem to drink way too much (and no, not the fun kind of drinking either). 😉

Recently, we began to notice how much Yoda would drink and urinate through out the day.  I was cleaning and refilling his water bowl more than three times a day, which all of a sudden clicked in my brain and I thought, “Oh no..” I called our local vet in Kathmandu immediately. He gave us a little trick to do at home to see if Yoda’s drinking was actually disproportionate.

Trick you can do at home to see if why is your cat drinking a lot of water.

If you believe your cat is drinking too much water, here is a simple at-home trick to see if it’s very serious or not.

A normal-sized cat should drink between 4+ ounces of freshwater per day.  Sometimes, depending on whether you give your cat dry or wet cat food, the amount of liquid water needed may change.

The amount can also vary depending on how much your cat weighs, too.

Yoda weighs around 4.5 kg (10 pounds, roughly).  Because we feed Yoda a dry-kibble diet which contains only 10% of water, he needs most of his water to come from, obviously..his water bowl.  Upon our calculations taking everything into account, Yoda should be drinking roughly 6+ ounces of water per day which is about the size of one small cup of water.

Why is my cat drinking so much water

To monitor if Yoda was drinking more than this, we filled a cup of water and emptied it into a clean water bottle.

We also emptied and cleaned Yoda’s water bowl and then filled the bowl with the water in the bottle.  Throughout the day, we would fill his bowl as needed from the water bottle.  For a complete 12 hours, we topped up the bowl several times.

However, at the end of the day, Yoda did not come close to finishing all of the water that remained in the water bottle.  We called our vet back and told him the news.  It turns out, Yoda just likes to pee a lot! 🙂 That’s our boy.

7 Possible Causes Why Your Cat is Drinking a Lot of Water

Cat’s naturally should not drink that much water.  But they can if there are some underlying problems causing them to have an unquenchable thirst. Here are some reasons for your question: Why is my cat drinking so much water?

Warm Weather

One common reason why your cat is drinking too much water could be the warm weather. Just like humans, cats also feel thirsty in the summer season and drink a lot of water. This is completely natural and good for the health of your kitty.

Cat’s food diet

As aforementioned above, sometimes the cause of cats drinking too much water is due to their food diet.

Most dry cat foods only have 7-10% of water moisture, whereas wet cat food can have around 70-80% of water moisture.

As we mention in our homemade cat food post, dry food should not be a cat’s only food option as it lacks much of the essential vitamins and necessary qualities your cat needs to stay healthy.

The lack of water moisture is one reason.  If you feed your cat(s) dry food more than wet food, make sure they always have plenty of clean drinking water to ensure they are reaching their daily required amount of water intake.

Hyperthyroidism in Cats

Hyperthyroidism (overactive thyroid)  is a glandular disorder that usually affects the older generation of cats [1]. Early warning symptoms include:

  • Unquenchable thirst and an enormous appetite
  • Weight loss
  • Excessive or increased urination, panting, shedding, and hyperactivity.

These are a few symptoms of hyperthyroidism in cats.

If your cat fits the description for more than 1 of these, then it’s best to be safe and schedule an examination right away at your local vet’s office. To diagnosis hyperthyroidism as definitive, your vet will most likely do a urinalysis and take a blood sample.

Liver Disease

The liver is a vital organ in cats which helps in protein synthesis, regulates energy, aids in digestion, and provides immunity to the body. Common signs of the liver disease include lethargy, weight loss, increased thirst, fever, or vomiting.

If your cat is consuming too much water there be maybe a reason she is suffering from liver disease. It is best to consult with your vet and provide the treatment to your kitty.

Feline Diabetes

Just like humans, cats can also get diabetes known as feline diabetes or diabetes mellitus, which results when the cat’s body cannot or does not produce insulin or does not properly use it [2].

There are four main symptoms of feline diabetes you need to watch out for.

  • wolf-like appetite
  • increased urination
  • increased water consumption
  • and significant weight loss even though he may be eating more.

Feline diabetes mainly occurs in older, obese male cats, but don’t think it cannot happen to your cat. So a trip to the vet is the best bet! For more great information regarding feline diabetes, we recommend this thorough article from Cornell’s College of Veterinary Medicine.

Why is my cat drinking so much water

Urinary Tract Disease

Feline (lower) urinary tract disease can signify painful, often bloody, frequent, and abnormal urination [3].

This can be brought on by several factors such as bladder stones, urinary tract blockage, among others.

If you notice your cat is licking the genitals, especially after urinating, blood in the urine, straining during urination, or frequent trips to the litter box with little to no result, then it is a severe and painful condition that must be checked immediately by your vet.  Do not wait! Your cat is in great pain.  Read more about FLUTD in cats here.

Chronic Kidney Disease

This is a significant life risk, especially for older cats. Frequent urination, particularly outside the litter box, coupled with drinking a lot of water (to make up for the kidney’s failure to retain water), is two big symptoms for feline kidney disease.

While these two symptoms are possible factors, there are many more symptoms before concluding that your cat may be experiencing kidney failure [4].  It is best to read more about this disease and consult with your veterinarian immediately.

What To Do If Your Cat Is Drinking Too Much Water?

If your cat is drinking too much water than it is best to look for the general behavior and health of the cat. Find out if the weather of the cat’s room is warm or are they consuming only dry food or drinking water because of the summer season. If the answer is yes then you don’t need to worry about your cat drinking excessive water. In case your cat is appearing unwell or feeling unwell it is best to consult with your vet.

Final Thoughts: Why Is My Cat Drinking So Much Water?

Hopefully, your cat does not show some of these more serious symptoms, but if so, do not wait to determine what is going on.

However, if your cat seems to be drinking lots of water, with no other severe symptoms, it could be only due to your cat’s diet.  To ensure your cat remains in good health here are some things to keep in mind:

  • Frequently clean and scrub your cat’s water bowl (bacteria and “slime” can accumulate very often, it does not suffice to just “top up” the water bowl with clean water – empty it all and give it a good scrub).


  • Observe your cat’s water intake throughout the day.  Changes in eating, drinking, and urinating behavior can signify more serious health issues, as mentioned above.


  • Always provide clean, freshwater.  If you notice your cat is drinking from other sources (sink, shower, pond, etc.), then this may signal that your cat is not getting enough water (although not in all cases, some cats are just attracted to running tap water).

Thank you for reading and following Fluffy Kitty!

Let’s work together and make sure our beloved feline friends are getting (more) than the required amount of basic needs every day.

See you next time on FK! Let us know if you have any questions or comments below. Though we are not trained veterinarians (yet) 😉 we would be more than happy to share our experiences as experienced cat crazy owners!


Thursday 2nd of April 2020

what is wolf-like appetite. I've never owned a wolf

The Fluffy Kitty

Tuesday 7th of April 2020

Hahah thanks for your comment! I will change that wording - my French partner wrote this article lol!


Thursday 28th of March 2019

my cat, who is rather chubby drinks quite a bit of water, but he has an all dry food menu. Seems sometimes he drinks alot and sometimes not so much. He changes all the time. He has a big appetite, but is not loosing weight (symptom of diabetes) so guess he's OK. No other odd behavior changes in him, he's happy, sleeps well, plays, purrs all the time and he is just beautiful!!

Brittany, Paul, & Yoda =^^=

Friday 29th of March 2019

Hi Linda! Sounds like he is a happy kitty! With an all-dry diet, most cats become quickly dehydrated. Enticing him to drink more will help prevent health issues in the future! If your cat loves trickling water, cat water fountains really boost cat's frequency to visit the water bowl compared to the water bowl with still water. Maybe try that! :-) Thanks for sharing with us about your baby!

Janet Olson

Saturday 2nd of September 2017

Thank you for your information about the excessive drinking of water there's also something it's after he drinks the water it I don't he he vomits it you vomit up water I thought at first maybe he was just drinking too much and so would cause them to vomit is there any advice you can give me for this thank you


Friday 8th of September 2017

Hi Janet, thanks very much for reaching out. What are your water bowl practices? Meaning do you wash the bowl out daily, is it made of plastic? Sometimes algae can form in plastic bowls with micro scratches (or in bowls that never get scrubbed), we know sometimes this can upset your cats stomach just enough to make them vomit afterwards. Also, if cats do drink rather rapidly and straight after scoffing down a meal, throw ups can happen. Otherwise if it's not something that seems like a quick fix it's best to see a vet. Usually we wait a day or two to see if Yoda's vomiting continues, which if it does, we consult a vet. So far we've been so lucky that when Yoda throws up (after eating or drinking water) it ends after a day. If the vomiting is often, we would recommend going to the vet cause it could be an underlying issue. We hope we were able to offer some helpful info. Best of luck!