Why your dog drinks a lot: causes and solutions

Is your dog suddenly drinking much more than usual? This could indicate an underlying health issue or a change in living conditions. On average, dogs consume 40–60 ml of water per kilogram of body weight per day. An excessive increase, especially when combined with increased urination, may have medical or behavioural causes. In this article, we discuss the possible causes and solutions, so you know when to consult a veterinarian.

Why is my dog drinking so much water?

Does my dog have kidney problems?

Kidney problems lead to a reduced ability of the kidneys to concentrate urine, causing a dog to produce more urine and therefore need to drink more. Chronic kidney disease is more common in older dogs and is accompanied by a reduced appetite, vomiting, weight loss and bad breath.

Could diabetes be the cause of excessive drinking?

Diabetes mellitus causes extreme thirst (polydipsia) and frequent urination (polyuria). Other symptoms include weight loss despite an increased appetite, lethargy and bad breath. Middle-aged and older dogs are particularly susceptible.

Does Cushing’s disease play a role?

In Cushing’s disease (hyperadrenocorticism), the body produces too much cortisol, which causes increased thirst, hunger, panting and thinning of the skin. This is more common in small dog breeds such as the Dachshund and the Poodle.

Can a liver condition lead to increased thirst?

Liver problems reduce the body’s ability to process toxins, causing a dog to drink a lot of water. Symptoms include jaundice, fatigue and a distended abdomen. A dog with liver cirrhosis must be examined by a vet as soon as possible.

Does my dog have a urinary tract infection?

Bacterial infections of the bladder or kidneys cause increased drinking and urination. You will often also see difficulty urinating, blood in the urine and an increased urge to pass small amounts of urine.

What is pyometra and why does it cause extreme thirst?

Pyometra is a life-threatening uterine infection in unspayed bitches. It causes vomiting, fever and discharge from the vulva. This condition requires immediate veterinary attention.

What is diabetes insipidus and why does it cause extreme thirst?

In diabetes insipidus, the body cannot retain water in the kidneys, causing it to produce urine continuously and forcing the dog to drink excessively. This is a rare hormonal condition that requires a blood and urine test.

Can cancer cause excessive drinking?

Some forms of cancer, such as malignant lymphoma, cause increased thirst. This is due to elevated calcium levels in the blood, which can lead to kidney problems.

What non-medical causes lead to increased water consumption?

• Dry food: A change in diet from wet to dry food increases water requirements.
• Certain medications, such as corticosteroids and diuretics, stimulate fluid intake.
• Stress and boredom can cause a dog to drink excessively.
• Hot temperatures and physical activity increase the need for hydration.

What should I do if my dog drinks a lot?

How can I check if my dog is really drinking too much?

1. Measure daily water intake: Note down how many millilitres your dog drinks each day. If this exceeds 100 ml/kg per day, you should consult a veterinarian.
2. Look out for additional symptoms: Weight loss, lethargy, vomiting or changes in urine indicate a problem.

Which medical tests help determine the cause?

• Urinalysis: Checks concentration ability, sugar levels and signs of infection.
• Blood test: Measures kidney function, liver enzymes, glucose and calcium levels.
• Imaging (ultrasound or X-ray) detects tumours, pyometra or kidney stones.
• Hormonal tests (Cushing’s suppression test or desmopressin test) identify endocrine disorders.

What treatments are available?

• Antibiotics for urinary tract infections.
• Insulin therapy for diabetes mellitus.
• Cushing’s disease-suppressing medication such as trilostane.
• Emergency surgery for pyometra.
• Pre-treatment: Wet food or other diet based on medical diagnosis.

When should I go to the veterinarian?

Consult a veterinarian if: Your dog suddenly starts drinking much more for no obvious reason. There are symptoms such as weight loss, lethargy or vomiting. The increased drinking is accompanied by frequent urination or blood in the urine.

Conclusion

A dog that suddenly drinks much more water may have an underlying medical cause, such as kidney problems, diabetes or Cushing’s disease. Non-medical factors, such as changes in diet or medication use, may also play a role. Monitor daily fluid intake and watch for additional symptoms to determine whether a visit to the vet is necessary.