Pet Health

Is my cat drinking too much water?

Worried your cat is drinking too much water? Learn about normal hydration levels, signs of excessive thirst, and when to consult your vet for concerns.
Author: Veterinary Team
Dial A Vet
Updated
June 6, 2025
|
Published
June 6, 2025
A cat drinking from a water bowl, looking curious and engaged, with a concerned owner observing nearby.

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Is your cat suddenly drinking more water than usual? As a pet owner, it’s natural to wonder if this change is normal or a sign of something more serious. Cats are known for being relatively low-maintenance when it comes to hydration, so a noticeable increase in water intake can raise questions and concerns. Let’s break down why this might be happening and what you can do to ensure your feline friend stays healthy.

⚠️ What to Watch For

Excessive drinking, also known as polydipsia, can sometimes indicate an underlying health issue in cats. But before you worry, it’s important to identify whether your cat is truly drinking more water or if it’s just a slight change in behavior. Here are some signs to watch for:

  • Your cat is frequently at their water bowl or fountain.
  • The water bowl is empty much faster than usual.
  • You notice wet spots or spills near the bowl more often.
  • Your cat is urinating more frequently, sometimes outside the litter box.

Keep in mind that some natural factors, like hot weather, diet changes, or increased activity levels, can temporarily cause your cat to drink more water. However, if the behavior persists or is accompanied by other symptoms, it’s time to dig deeper.

🔍 Possible Causes

There are several medical and environmental reasons why your cat might be drinking too much water. Here are some of the most common causes:

  • Kidney Disease: Chronic kidney disease (CKD) is one of the most common health issues in older cats. As the kidneys lose their ability to concentrate urine, your cat may drink more to compensate.
  • Diabetes Mellitus: Cats with diabetes often experience excessive thirst and urination due to high blood sugar levels.
  • Hyperthyroidism: An overactive thyroid gland can lead to increased metabolism, which in turn increases thirst.
  • Urinary Tract Infections (UTIs): While less common, some UTIs can cause increased drinking and urination.
  • Dietary Factors: Cats on a dry food diet often drink more water to compensate for the lack of moisture in their food. High-sodium diets can also contribute to increased thirst.

While these are some of the primary causes, other less common conditions like liver disease or certain medications can also lead to polydipsia. It’s essential to monitor your cat closely and consult a vet if you notice consistent changes.

✅ What You Can Do at Home

If your cat is drinking more water than usual, there are a few steps you can take at home to assess the situation and support their health:

  • Track their water intake: Measure how much water your cat drinks daily. The average cat typically drinks around 50–70 milliliters of water per kilogram of body weight per day.
  • Observe for other symptoms: Watch for weight loss, changes in appetite, vomiting, lethargy, or unusual behavior.
  • Switch to wet food: Adding moisture-rich canned food to your cat’s diet can reduce the need for them to drink excessive water.
  • Keep the environment consistent: Avoid sudden changes in diet, routine, or temperature that could temporarily affect your cat’s hydration habits.

While these steps can help you gather valuable information, they are not a substitute for veterinary care. If your cat’s increased thirst continues or worsens, seek professional advice.

💡 When to Call a Vet

Excessive drinking can be a sign of serious health problems, so it’s crucial to consult a veterinarian if you notice any of the following:

  • Your cat’s increased thirst lasts for more than a few days.
  • They exhibit other symptoms like vomiting, diarrhea, weight loss, or changes in appetite.
  • They seem lethargic or are hiding more than usual.
  • There’s a noticeable change in their urination habits, such as frequent trips to the litter box or accidents outside of it.

A vet can perform diagnostic tests, such as blood work, urinalysis, and imaging, to identify the underlying cause. Early detection and treatment can make a significant difference in managing your cat’s health.

FAQs

Q: How much water is normal for a cat to drink each day?
A: On average, a healthy cat drinks about 50–70 milliliters of water per kilogram of body weight daily. However, this can vary depending on their diet and activity level.

Q: Can dry food cause my cat to drink more water?
A: Yes, cats on a dry food diet often drink more water to compensate for the lack of moisture in their meals. Consider incorporating wet food to provide additional hydration.

Q: Should I be worried if my cat drinks a lot but seems fine otherwise?
A: While occasional increases in water intake can be normal, persistent polydipsia may indicate an underlying health issue. It’s best to consult a vet for a thorough evaluation.

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References

While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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