Drooling, lack of appetite, and lethargy in a cat are serious symptoms that can be caused by a variety of illnesses, some of which are potentially life-threatening.
Here are some potential causes of these symptoms:
* Gastrointestinal issues: This could include anything from a simple upset stomach to a more serious condition like pancreatitis or intestinal blockage.
* Urinary tract infection (UTI): UTIs can be very painful and cause a cat to become lethargic and stop eating and drinking.
* Kidney disease: This can be a serious condition that can lead to dehydration and loss of appetite.
* Dental problems: Painful teeth can make it difficult for a cat to eat, leading to weight loss and lethargy.
* Poisoning: Cats can be poisoned by a variety of substances, including household cleaners, plants, and medications.
* Infections: Viral or bacterial infections can also cause these symptoms.
* Metabolic disorders: Conditions like diabetes can lead to changes in appetite and energy levels.
Please do not delay in seeking veterinary care for your cat. Your veterinarian will be able to diagnose the underlying cause and recommend the appropriate treatment.