Dog Excessive Thirst

Dog

Excessive thirst (polydipsia) in dogs means your dog is drinking significantly more water than usual. While increased thirst can be normal after exercise or on hot days, persistent excessive thirst often indicates an underlying medical condition that requires veterinary attention. It is frequently accompanied by increased urination (polyuria).

Possible Causes

  • Diabetes mellitus
  • Kidney disease or kidney failure
  • Cushing's disease (hyperadrenocorticism)
  • Urinary tract infection
  • Liver disease
  • Hypercalcemia (elevated blood calcium)
  • Pyometra (uterine infection in unspayed females)
  • Medication side effects (steroids, diuretics, anti-seizure drugs)
  • Addison's disease (hypoadrenocorticism)
  • Dehydration from vomiting, diarrhea, or heat exposure

When to See a Vet
Important

Seek veterinary care if any of the following apply:

  • Your dog is consistently drinking more water than normal for several days
  • Increased thirst is accompanied by increased urination or accidents in the house
  • Your dog is also losing weight, lethargic, or has a decreased appetite
  • You notice a change in urine color or odor
  • Your dog is also vomiting or has diarrhea
  • Your unspayed female dog is excessively thirsty (possible pyometra — an emergency)
  • Your dog is drinking and immediately vomiting the water back up

First Aid Tips
Home Care

These tips can help while you monitor the situation or wait for your vet appointment:

  1. Measure your dog's daily water intake to report to your vet (normal is about 1 oz per pound of body weight per day)
  2. Ensure fresh, clean water is always available — do not restrict water
  3. Note any other symptoms (increased urination, weight changes, appetite changes)
  4. Collect a urine sample if possible (your vet may need it for testing)
  5. Keep your dog cool and out of excessive heat
  6. Review any medications your dog is taking with your vet

Related Symptoms

Dog Diarrhea
Dog Limping

Breeds Commonly Affected

golden retriever
poodle
beagle

Is this an emergency?

If your pet is in severe distress, call your vet or an emergency animal hospital immediately. For poisoning emergencies, call the ASPCA Animal Poison Control Center at (888) 426-4435.

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