Water is the one thing a dog can't do without, so a dog that suddenly stops drinking is understandably worrying. Sometimes the cause is trivial — the water tastes odd or the weather cooled down — and sometimes it's an early sign of illness. Because dehydration can escalate quickly, it's worth understanding why dogs stop drinking, how to spot the warning signs, and when refusing water becomes an emergency.
How much water should a dog drink?
As a rough guide, dogs need roughly one ounce of water per pound of body weight each day (about 55–70 ml per kilogram), though this varies with heat, exercise and diet. Dogs on wet food naturally drink less because their food is mostly water, while dogs on dry kibble drink more. A short-term dip after a rainy, cool day or a big drink earlier isn't alarming. The concern is a sudden, sustained drop in drinking, especially alongside other changes in appetite, energy or toilet habits.
Common reasons a dog stops drinking
1. Illness or nausea
Feeling unwell suppresses thirst just as it does in people. Infections, kidney or liver issues, and an upset stomach can all put a dog off water, often alongside reduced appetite.
2. Dental pain or a mouth injury
A sore tooth, gum infection or something lodged in the mouth can make lapping water painful, so the dog avoids the bowl.
3. Change in environment or routine
Travel, a new home, a moved water bowl or a different water source can all put a fussy dog off. Some dogs dislike the taste of unfamiliar tap water or the smell of a plastic bowl.
4. Weather and activity level
On cool, quiet days a dog simply needs less water. A drop in drinking that matches the weather and comes with no other symptoms is usually nothing to worry about.
5. An off-putting bowl or spot
A dirty bowl, a noisy location, or a bowl next to the food that catches crumbs can all deter drinking. Some dogs prefer a wide, shallow bowl or moving water they can't see their reflection in.
6. Age and mobility
Senior dogs with arthritis may drink less simply because bending to a low bowl hurts. Raising the bowl can make a real difference.
Signs of dehydration & when it's an emergency
Check for dehydration and call a vet urgently if your dog shows these signs:
- Skin that stays "tented" when gently pinched at the shoulders instead of springing back
- Dry, tacky or pale gums, and a slow return of colour when you press them
- Sunken-looking eyes, thick saliva or a dry nose and mouth
- Lethargy, weakness or unsteadiness
- Refusing water alongside repeated vomiting or diarrhoea — an emergency, as fluid is being lost as well as not replaced
- No water intake at all for more than 24 hours
How to encourage your dog to drink
- Offer fresh, cool water in a clean bowl and try a couple of different bowl styles — stainless steel, ceramic, wide and shallow — to find your dog's preference.
- Add water or low-sodium broth to their food, or mix in some wet food, to sneak fluids in through meals.
- Try a pet water fountain — many dogs are drawn to moving, oxygenated water and drink far more from it.
- Place several water stations around the home, and raise the bowl for senior or large dogs so drinking is comfortable.
- Offer ice cubes or ice-lolly treats made from broth on hot days to make hydration fun.
The right vessel can turn a reluctant drinker around. A clean, well-placed water bowl or fountain — raised for comfort and topped up with fresh, cool water — often gets fussy dogs lapping again.
Shop bowls & feeding gear →Which dogs are most at risk?
Some dogs dehydrate faster and need closer watching. Puppies and toy breeds have less reserve and decline quickly. Senior dogs may drink less due to arthritis or underlying illness, and any dog that is vomiting, has diarrhoea or is running a temperature loses fluid rapidly. Flat-faced breeds and heavily coated dogs are also more vulnerable in hot weather. If your dog is in one of these groups, don't wait long to act on reduced drinking — early support and an early vet call make all the difference.
Not sure how serious it is? Scan the symptom in seconds
MyFurtopia's AI Pet Health Scanner lets you log your dog's drinking, appetite and symptoms to get an instant, vet-informed read on how urgent it is — and whether you should head to a clinic now. It's free to try.
Download the MyFurtopia AppFrequently asked questions
How long can a dog go without drinking water?
A healthy adult dog can typically go around 24 to 72 hours without water, but dehydration begins long before that and can quickly become dangerous. Never treat it as a deadline — puppies, seniors, small breeds and unwell dogs decline much faster. If your dog hasn't had any water in 24 hours, or is refusing water alongside vomiting, diarrhoea or lethargy, contact your vet promptly.
How do I know if my dog is dehydrated?
Gently pinch the skin between the shoulder blades — in a hydrated dog it springs back quickly; if it stays tented, that's a sign of dehydration. Other clues include tacky or dry gums, sunken-looking eyes, thick saliva, lethargy and loss of skin elasticity. To check gums, press a finger against them: the colour should return within about two seconds. If it's slow, or your dog seems weak, see a vet.
When should I take my dog to the vet for not drinking?
See a vet the same day if your dog has refused water for more than 24 hours, shows signs of dehydration, or if the not-drinking comes with vomiting, diarrhoea, lethargy, a swollen belly, or a known illness. Refusing water plus repeated vomiting is an emergency because fluid is being lost as well as not replaced. When in doubt, call your vet.
This guide is educational and not a substitute for professional veterinary care. If you're worried about your dog, contact your vet.