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why senior cats get dehydrated

3 Reasons Why Older Cats Get Dehydrated and How to Help Them

If your cat is drinking more or less than she usually did or showing signs of dehydration, it’s important to monitor her behavior closely and schedule a visit to your veterinarian right away. Older cats may be more susceptible to chronic illnesses that result in dehydration. These include: 

  • Kidney disease
  • Diabetes
  • Hyperthyroidism

3-minute read

Please note: This article is informational only and you should always speak with your veterinarian to obtain your cat’s health treatment plan.

While your cat may have always had their quirks, you likely know exactly what’s normal for your cat. So when your older cat gets dehydrated for no apparent reason, it’s cause for concern. 

First, let’s talk about how to tell if your cat is dehydrated. 

How to Tell if Your Cat Is Dehydrated

Even if your cat is drinking as much as she always has, she may still be dehydrated. So it’s important to not only monitor her fluid intake, but carefully observe her day-to-day behavior and make note of any of the following so you can discuss with your veterinarian. 

Signs that your cat is dehydrated include: 

  • Low energy
  • Pale and/or dry gums
  • Panting
  • Dry skin
  • Less urine in the litter box
  • Sweating (check the paws!)
  • Increased heart rate
  • Appetite changes/refusal to eat
  • Sunken eyes

Remember, you know your cat the best! So if you see any of these signs of dehydration in your cat, please schedule an appointment with your veterinarian. 

3 Serious Illnesses That Cause Dehydration in Older Cats

If your cat is a senior, or even middle aged, it’s important to rule out serious reasons for dehydration. These include: 


Diabetes may cause increased thirst, so it may seem like your cat is getting plenty of fluids. However, it also causes increased urination, putting your cat at risk for dehydration. 

According to Metropolitan Veterinary Associates, cats older than 5 are more likely to have diabetes than younger cats. Risk factors for feline diabetes are very similar to those in humans: obesity, inactivity, and even genetics. 

Diabetes needs to be managed with the help of your veterinarian. 


Hyperthyroidism is an overproduction of thyroid hormone and occurs mostly in cats 10 years or older. This condition causes the kidneys to produce more urine and can also cause diarrhea and vomiting, so your cat may become dehydrated. 

You can learn more about hyperthyroidism in senior cats in this blog post. It’s a serious condition that you’ll need to discuss with your veterinarian.

Kidney Disease

Kidney disease is most common in older cats, but it can even affect middle aged cats. When your cat’s kidneys no longer work properly, you may notice your feline friend drinking and urinating more than she used to. And despite the increase in fluid intake, your cat may still suffer from dehydration. 

Kidney Disease in cats must be managed by a veterinarian and it’s important to get help quickly. 

To learn more, please read my article about kidney disease in cats

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How to Get Your Senior Cat Hydrated

If you’ve addressed any serious health issues with your vet and come up with a treatment plan, or if it’s determined that your cat is purr-fectly fine but not drinking enough, it’s time to get your cat hydrated!

Cats are known for being particular about their wants and needs, so you may have to try several of these hydrating tips before landing on the one that works best for your cat. 

Use a Fountain

Photo of Catit Cat Drinking Water Fountain

Cats are known for giving preference to running water. But leaving your faucet running isn’t a good idea. Instead, try a cat fountain. My favorite is the Catit Flower Fountain. It’s inexpensive and satisfies your cat’s inner desire to drink from running water. 

Add Flavor to Your Cat’s Water

Some cats just like it fancy! If your cat simply doesn’t like water, try adding a little bit of tuna juice or broth to your cat’s water dish.

Add Water to Your Cat’s Food

If you can’t get your cat to increase straight water intake, try adding a bit more fluid to her kibble. Or, incorporate canned food, which contains more water.

Put Ice Cubes in the Bowl

Your cat may be more likely to lick her water than drink it, and that’s OK! A few ice cubes in her bowl can help increase her water intake.

The Tail End

If your cat is dehydrated, it’s important to get help right away and rule out any serious conditions. But if your cat is healthy or simply needs at-home care to increase water intake, there are simple ways to accomplish this and get your cat hydrated again. 

Hydration is just one important factor in your cat’s overall health and it’s important to monitor your cat’s vitals regularly at home. Need help knowing how to monitor your kitty’s vital signs? Grab my free checklist below!

cta check your cat's health with this free checklist

Kristen Levine is a nationally acclaimed pet expert, influencer, and Fear Free Certified® Professional with over 30 years of experience in the industry. She's helped millions of pet parents provide the best care at every stage of their pet’s life.

Her blog, Pet Living with Kristen Levine has been featured in Pop Sugar, Good Housekeeping, New York Times, USA Today, and more.

She's also the founder of FWV Fetching, the first marketing agency exclusively serving pet and animal health companies.

Her early work with the SPCA led her to a lifelong career in the pet industry, advocating for pet adoption and rescue as well as for pets and their parents here on her blog and in the media.

She’s frequently booked on satellite media tours and national shows, like FOX & Friends, Good Morning America, and Daytime, to talk about pet trends and new products.

Insanely passionate about pets since she was a little girl, Kristen has had more than 30 pets in her lifetime — including dogs, cats, goats, donkeys, a horse, a gerbil, mice, and chickens!

In 2022, she launched to help pet parents keep pet homes clean -- to love more, stress less.

Kristen is married and lives in the mountains of North Carolina with her dog Tulip.

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