My cat is losing a lot of weight. Is this normal for an active cat?

Weight loss is possible due to increased activity, but 9kg to 4kg is more drastic than I would expect. I would discuss doing bloodwork with your vet. Increased activity and weight loss is common in cats with hyperthyroidism. Weight loss can also be caused by kidney disease and diabetes. All 3 of these conditions can be diagnosed with simple bloodwork (CBC, chemistry, thyroid panel) and urinalysis.

A 3 pound weight loss is indeed significant and not normal. There could be many reasons for this, and there is just no way to pinpoint the cause without a hands-on exam and possibly blood work. I suggest you take your kitty to a veterinarian for a wellness exam.

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.

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.

No, it is not normal for her to be losing weight and for you to be able to feel her bones. She could be hyperthyroid so she should be examined by a vet for a thyroid test. It is a common disease in older cats and causes weight loss. Your vet can prescribe a medication to treat, if she has an elevated thyroid level.

Yes, I would definitely be concerned about Joey. Rapid weight loss can be a sign of a medical illness, and it's certainly not normal for a cat to lose this much weight so quickly without any changes in diet. Weight loss can be a very general sign of illness, and it could be caused by dental disease, systemic illness, infection, kidney disease, hyperthyroidism, diabetes inflammation, injury, or even cancer. I would take him into the vet first thing Monday for a physical exam, blood tests, and urinalysis. The vet can diagnose what has caused his rapid weight loss and how best to treat it. Good luck, I hope this helps!

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.