Why Cats Struggle to Drink Enough Water
Cat hydration is one of the most underappreciated aspects of feline health. Cats evolved as desert predators who obtained most of their moisture from prey rather than from standing water sources. This evolutionary background means that domestic cats have a naturally low thirst drive compared to dogs — they do not feel the urge to drink water proactively until they’re already mildly dehydrated.
This low thirst drive becomes a significant health risk when cats are fed dry kibble as their primary or sole diet. Dry cat food contains only 8–12% moisture, compared to 70–80% in wet food and roughly 70% in fresh prey. A cat eating exclusively dry food must drink substantially more water to compensate — and many simply don’t, leading to chronic mild dehydration that can damage the kidneys and urinary tract over time.
Chronic dehydration is a significant contributing factor to two of the most common health problems in cats: feline lower urinary tract disease (FLUTD) and chronic kidney disease (CKD). Increasing your cat’s water intake is one of the most impactful things you can do for their long-term health — and fortunately, there are many effective strategies to encourage it.
Signs Your Cat May Not Be Drinking Enough
Cats can be subtle about dehydration. Watch for these signs that indicate your cat may need more fluids:
- Infrequent or very dark, concentrated urine: Healthy cats urinate 2–4 times per day. Dark yellow or amber urine indicates insufficient hydration.
- Constipation: Hard, dry stools or straining in the litter box can result from dehydration pulling water from the colon.
- Lethargy: Mild dehydration reduces energy and motivation.
- Poor coat quality: A dull, dry coat can reflect insufficient internal hydration.
- Dry or sticky gums: Healthy gums should feel moist and slippery. Tacky gums suggest dehydration.
- Sunken eyes: A visible sign in moderate to severe dehydration.
- Skin turgor: Gently pinch the scruff — it should snap back immediately. A skin tent that holds its shape indicates dehydration.
If you observe signs of moderate or severe dehydration (especially combined with vomiting, diarrhoea, or loss of appetite), contact your vet promptly rather than trying to manage it at home.
10 Practical Tips to Increase Your Cat’s Water Intake
Encouraging a cat to drink more requires understanding their preferences and instincts. These strategies are effective and easy to implement:
1. Switch to or add wet food: The single most impactful change. Replacing even half of your cat’s dry kibble with wet food or raw food dramatically increases moisture intake. Cats absorb water from food much more naturally than from drinking bowls.
2. Use a cat water fountain: Cats are instinctively attracted to moving water — in the wild, still water is more likely to be stagnant and contaminated. A circulating water fountain mimics a running stream and significantly increases drinking for many cats. Stainless steel or ceramic fountains are easiest to keep clean.
3. Provide multiple water stations: Place several water bowls in different locations around the home — cats often prefer a water source that is not adjacent to their food bowl (in nature, a water source near a kill site may be contaminated). Try near sleeping spots, in quiet corners, and on different levels of the home.
4. Use wide, shallow bowls: Cats are sensitive about their whiskers touching the sides of bowls — a deep or narrow bowl causes “whisker fatigue” and can discourage drinking. Use a wide, shallow bowl or a flat plate with a small amount of water.
5. Keep water fresh: Change water at least once daily, twice in warm weather. Cats detect stale water and may refuse it. Thoroughly wash bowls with hot soapy water every 2–3 days to remove biofilm that builds up quickly.
6. Try different water types: Some cats prefer filtered or bottled water over tap water (chlorine smell can be off-putting). Others prefer slightly cooled water. Experiment to find what your cat favours.
7. Add a splash of low-sodium broth: A small amount of plain, low-sodium chicken or fish broth added to water can make it more enticing for cats that otherwise ignore their bowl.
8. Offer water-rich snacks: Small portions of plain cooked fish, raw goat milk, or cat-safe wet treats add supplemental moisture to the diet.
9. Place bowls away from litter trays: Cats naturally avoid drinking near their toilet area. Ensure all water sources are well away from the litter box.
10. Add water to dry food: Softening kibble with warm water or broth is an easy way to increase moisture content for cats that refuse to transition to wet food.
How Much Water Should a Cat Drink Per Day?
A cat’s total water intake (from food and drinking combined) should be approximately 50–70 ml per kilogram of body weight per day. For a typical 4 kg (8.8 lb) cat, that’s roughly 200–280 ml of total daily fluid.
Cats fed wet food may drink very little from their water bowl because they’re getting most of their moisture from food — this is normal and healthy. Cats on dry food need to drink significantly more from their bowl to compensate.
Suddenly increased water intake (polydipsia) is a warning sign worth investigating. If your cat is drinking noticeably more than usual, it may indicate diabetes, hyperthyroidism, kidney disease, or other conditions requiring veterinary evaluation. Keep a mental note of your cat’s normal drinking habits so changes are recognisable.
Hydration and Specific Health Conditions
For cats with certain health conditions, optimising hydration is not just beneficial but critical:
Chronic Kidney Disease (CKD): The most important dietary change for cats with CKD is increasing fluid intake. A moist diet — wet food, raw food, or water-added kibble — significantly slows kidney disease progression and supports the kidneys’ ability to flush waste products.
Feline Lower Urinary Tract Disease (FLUTD) and Urinary Crystals: Dilute urine (produced by a well-hydrated cat) reduces the concentration of minerals that form struvite or calcium oxalate crystals and urinary plugs. Many veterinary urinary diets are available in wet formulations for this reason.
Constipation: Adequate hydration is essential for normal gut motility and stool consistency. Chronically constipated cats almost always benefit from increased dietary moisture.
Post-illness recovery: Cats recovering from illness, surgery, or dental work often have reduced appetite and water intake. Offering broth, warmed wet food, or a pet rehydration solution (such as diluted Pedialyte unflavoured — confirm with your vet) can support recovery.