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Why is my dog drinking excessively, hungry, anxious, and aggressive?

Updated On September 23rd, 2025

Pet's info: Dog | Border Collie | Male | 2 years and 11 months old

Is it possible that trick is suffering from hyperthyroidism he drinks 2.4 litres of water a day is constantly hungry and has become more anxious and aggressive his weight goes up and down daily he had blood test CBC on Monday nothing wrong he had urinalysis done Tuesday normal he hasn't drunk that much before I tried giving 2 calmex today before walking he was just as nervy and he is still drinking huge amounts thoughts please

1 Answer

Most Helpful Answer

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Answered By Emily, DVM

Veterinarian

Published on June 3rd, 2017

Hyperthyroidism is rare in dogs, particularly his age. His increased water intake could be due to kidney issues, Diabetes insipidous as well as psychogenic water drinking. You can discuss with your veterinarian if they feel any additional blood tests or a water deprivation test is needed.

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