It's crucial to consult a veterinarian immediately. There are many possible reasons for excessive thirst and decreased appetite, and some of them could be serious.
Here are some of the things a vet will look at:
* Underlying medical conditions: Kidney disease, diabetes, Cushing's disease, and even infections can cause increased thirst and a decrease in appetite.
* Changes in diet: A sudden change in food or a diet that is not nutritionally complete could contribute to changes in appetite.
* Medications: Some medications can have side effects that cause increased thirst.
* Other factors: Stress, anxiety, and even environmental changes can impact a dog's appetite and water intake.
Don't wait to see a vet. Early diagnosis and treatment can significantly improve your dog's chances of a full recovery.