Owners may become aware that their dog has suddenly begun to drink lots of water. This may be the clue to a number of disorders, some only transitory, others of a more serious, chronic nature.

We may notice that the dog’s bowl is constantly empty or the dog may be observed licking at taps or lapping at every puddle while on a walk. Cats may be observed licking the bathroom tiles or hopping into the bath or sink.

  1. Dry feeding: A change of feeding may alter the dog’s drinking pattern. A change to dry feeding requires the absorption of far more water from the bowel. The dog derives much of its daily fluid intake from its food. If a diet of predominantly dry food is supplied, the water intake is significantly lower than a dog fed a mixture of canned and fresh food.
  2. Salty foods: Some foods contain much more salt than others and stimulate an increased thirst.
  3. Diarrhea: A temporary attack of diarrhea will be associated with an increased water intake. The two most frequent causes of diarrhea are wrong feeding and worms. It is a mistake to keep up the bread and milk type of food when the puppies have been weaned.
  4. Medications: Some medications cause the dog to drink more than usual. Corticosteroids, used to treat skin conditions or arthritis, have a marked effect when given in fairly high doses at the commencement of treatment.
  5. Inflammation: Dogs with an inflamed throat or with tonsillitis will lap small quantities of water frequently while refusing solid food.
  6. Constipation: Dogs with long-standing constipation seem only interested in drinking copious amounts of water.
  7. Serious diseases: The two most serious diseases to be considered when the dog has a history of excessive thirst over a long period are diabetes and nephritis.

Diabetes in dogs

Diabetes is a disorder of the carbohydrate metabolism of the dog caused by a deficiency of the hormone insulin.

Insulin is secreted by specialized cells in the pancreas. The function of insulin in the body is to convert excess glucose to carbohydrate which is stored in the liver for the future needs of the animal.

In the diabetic dog or cat, the daily energy requirements must be gained from the immediate intake of sugars. Any energy requirement not able to be met from the daily food supply must be supplied by the breakdown of fats.

This process is not as efficient as the normal breaking down of stored carbohydrates and over a long time not only does the animal lose weight despite an increased appetite, but the waste products of fat breakdown can cause certain toxic effects in the animal’s body.

Free glucose is excreted by the dog’s kidney cells and this requires much greater amounts of water.

Kidney disease in dogs

Nephritis is a disease of the cells of the kidney that eventually leads to an impairment in their function.

Kidney cells remove the waste products of metabolism and excrete them via the urine. Any impairment in their function is usually detected by the presence of protein in the urine. As more kidney cells are affected the dog compensates for this lack of efficiency by drinking more water in order to flush the impurities with an increased flow of fluid.

Eventually, an animal with nephritis will lose weight, but unlike the diabetic animal whose appetite is excessive, it gradually demands less and less food.

It is important to seek veterinary advice where there is a noticeable increase in water intake over a protracted period. Both nephritis and diabetes can be controlled if treatment and dietary changes are begun before the disease process has progressed too far.

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  1. Hi ,

    I have a Kelpie cross. Approx 12 years old. Drinks excessive water and urinates far more. Has a greater appetite also. What should I do?

    1. Any dog showing the early warning signs of eating more than usual but still losing weight, and drinking a lot of water should be examined by your veterinarian as treatment of the uncomplicated diabetes is quite easily.

  2. My 15yo kelpie started Synovan injections 3 weeks ago. The last couple of weeks he’s been drinking probably 2-3 times as much water as before. Otherwise he’s the same – appetite fine, still bright. Can Synovan increase thirst? He was on Meloxicam previously so I’m also wondering about kidney disease.

    1. The organ tends to show signs of degeneration as the dog ages is the kidney. An early sign of kidney disease is an increased thirst. The onset of kidney disease is quite gradual. The affected dog tends to drink more water. Gradually the dog loses weight, although it may continue to be bright and eat well. It is a good idea to ask your veterinarian if you observe these signs.

  3. Pet Health – I don’t think you answered the question from Vicki. Can Synovan increase thirst? I have exactly the same question. My dog has quadrupled his intake of water and now has accidents whilst asleep due to the amount of fluid he has had.

    1. Some cases reported that an excessive water intake seen in some dogs with injections of Synovan (or Cartrophen), but it is not a usual side effect of this medication. Many conditions in dogs can lead to excessive thirst or dehydration, including kidney disease, diabetes, and cancer. You can get a blood test for your dog if there is any doubt of diseases or other unseen abnormalities.

  4. My dog was attacked by a dog and went unconscious. Now he drinks lots of water and pees a lot. Sometimes my dog is suddenly peeing while walking.