Why is My Cat Drinking so Much Water

June 13, 2025 Cat Water Fountains Australia

Cats are sneaky little creatures. They nap 18 hours a day, judge your life choices from across the room, and somehow still have you wrapped around their paw.

But when your cat suddenly starts guzzling water like it’s going out of fashion? That’s a red flag you don’t want to ignore.

If anything feels off or urgent, definitely check in with your vet.

1. Your Cat Might Be Dehydrated

Seems obvious, but it’s worth checking first.
Hot weather, a bout of vomiting, or just being a bit off their food can lead to dehydration. When that happens, your cat will naturally try to fix it by drinking more.

Make sure they’ve got access to fresh, clean water at all times.

If you notice signs like sticky gums or reduced skin elasticity, speak with your vet—they can check for dehydration.

2. It Could Be Diabetes

Diabetes in cats messes with how they process sugar. One of the first signs can be excessive drinking and peeing.

Other signs people often report:

Weight loss despite a healthy appetite
Low energy
Peeing outside the litter box

If any of these sound familiar, your vet can run simple tests to check what’s going on.

3. Kidney Disease (Especially in Older Cats)

Older cats often develop kidney issues. One of the classic signs? More frequent drinking and urination. It’s because the kidneys can’t concentrate urine properly.

What else to watch for:

Vomiting
Bad breath
Dull coat or weight loss
Seeming extra tired

Next step: Only a vet can diagnose this, but if your older cat is drinking more and acting differently, it’s worth making an appointment.

4. Hyperthyroidism Can Also Trigger Thirst

Hyperthyroidism means the thyroid gland is producing too much hormone. That can make your cat extra thirsty, even if they seem otherwise fine.

Things cat owners often notice:

Weight loss with increased appetite
More vocal or restless behaviour
Occasional vomiting or diarrhea

Again, this is something your vet can test and treat.

5. It Might Just Be Preference or Behaviour

Finally, it's possible that your cat is drinking more water simply due to a behavioral issue. Some cats prefer running water to still water and may drink more from a fountain or dripping tap. Additionally, stress or anxiety can cause changes in your cat's behavior, including increased water intake. If you suspect a behavioral issue, it's important to observe your cat's behavior and seek advice from a veterinarian or behaviorist.

Final Thoughts (and a Gentle Nudge)

If you notice that your cat is drinking an excessive amount of water, it's important to pay attention and act. From simple things like switching to a water fountain to more serious medical issues like diabetes, there are many potential causes for increased water consumption in cats. By being aware of the signs and symptoms and working closely with your veterinarian, you can help ensure that your feline friend stays happy, healthy, and well-hydrated. Remember, a well-hydrated cat is a happy cat!

Note: The information provided in this article is for educational purposes only and should not be taken as veterinary advice. Always consult with your veterinarian before making any changes to your cat's diet or healthcare routine.

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