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Polydipsia in dogs is defined as the excessive thirst in excess of 100 ml/kg/day.

Polydipsia is normally due to polyuria, which is usually concurrent and dogs drink to compensate for urine loss, except in diabetes insipidus, where polydipsia starts first.

There are many causes of polydipsia, including:


  1. Ramsey IK et al (1999) Concurrent central diabetes insipidus and panhypopituitarism in a German shepherd dog. J Small Anim Pract 40(6):271-274
  2. Schwedes CS (1999) Transient diabetes insipidus in a dog with acromegaly. J Small Anim Pract 40(8):392-396
  3. Cohen M & Post GS (1999) Nephrogenic diabetes insipidus in a dog with intestinal leiomyosarcoma. J Am Vet Med Assoc 215(12):1818-1820
  4. Henderson SM & Elwood CM (2003) A potential causal association between gastrointestinal disease and primary polydipsia in three dogs. J Small Anim Pract 44(6):280-284