Here's why:
* Drinking a lot but not eating is a red flag. This can be a sign of several serious conditions, including diabetes, kidney disease, hyperthyroidism, and even liver problems.
* Salivation can be caused by dental issues, stomach upset, or even poisoning.
* Your cat's age is a factor. Older cats are more susceptible to certain health issues.
Please don't delay seeking professional veterinary care. A veterinarian can perform a physical exam, run blood work, and other tests to determine the underlying cause and recommend appropriate treatment.
In the meantime, here are a few things you can do:
* Keep your cat hydrated. Encourage him to drink water.
* Keep him comfortable. Provide a quiet and warm place for him to rest.
* Avoid giving him any medication or home remedies without consulting a vet.
Remember, a veterinarian is the best resource for diagnosing and treating your cat's health problems.