Why is my cat losing weight, losing balance, and acting clingy?

Sudden weight loss is always a very big warning light that should not be taken lightly, it's usually a sign of an internal disease that needs to be investigated, i strongly recommend taking Winter to the vet in order to get it checked, he will need to have a blood test done and possibly an xray as well in order to attempt to diagnose the reason for these symptoms.

Poor girl. With those symptoms, I would highly recommend a vet visit as soon as possible. There are many different possible causes and the symptoms you're describing span multiple organ systems, so I can't give you a very accurate "most likely" list. The vet will start with a detailed physical exam and go from there, likely including some blood work and x-rays.

I am sorry to hear about Tessa’s weight loss. Things that can cause this include liver and kidney disease, diabetes, cancer, infection, parasites, heart disease and other. Any sudden, noticeable weight loss definitely merits a visit to the vet who will likely want to do bloodwork to help determine the cause. Best of luck to you and Tessa!

The deworming pill and the symptoms you described have nothing to do with each other, if he is losing his fur and losing weight he is suffering from something serious. Sudden weight loss is always a very big warning light that should not be taken lightly, it's usually a sign of an internal disease that needs to be investigated, i strongly recommend taking him to the vet in order to get it checked, he will need to have a blood test done and possibly an xray as well in order to attempt to diagnose the reason for these symptoms.

Weight loss coupled with a normal or increased appetite can be a sign of diabetes or hyperthyroidism, to name a couple of possibilities. I recommend getting Felix seen by your vet as soon as possible for an exam and labwork to determine the reason for his weight loss and get him started on treatment.

These are indeed an unusual set of symptoms, thyroid disease and diabetes would be the first suspects for a cat with increasing appetite and weight loss. A specialist ultrasound scan of the abdomen may be worth while to investigate difficulties with food digestion and absorption or even tumours using up the calories

Significant weight loss is always a concern, especially if his appetite is good. Hormonal conditions such as diabetes and thyroid disease or poor absorption and digestion of his food is possible and I would recommend a full physical and blood panel as soon as possible in order to stabilise his condition before he becomes too frail